cope with changes in BASE messages

89 files changed, 253 insertions, 169 deletions

diff --git a/regress/mdoc/Fl/punct.out_lint b/regress/mdoc/Fl/punct.out_lint
index 4bd4cff2..4d7e5ca9 100644
--- a/regress/mdoc/Fl/punct.out_lint
+++ b/regress/mdoc/Fl/punct.out_lint
@@ -1,3 +1,4 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:45:6: STYLE: no blank before trailing delimiter: Fl a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Fo/noarg.out_lint b/regress/mdoc/Fo/noarg.out_lint
index eb1a5dc8..eeb7ee5f 100644
--- a/regress/mdoc/Fo/noarg.out_lint
+++ b/regress/mdoc/Fo/noarg.out_lint
@@ -7,6 +7,7 @@ mandoc: noarg.in:37:2: WARNING: skipping empty macro: Ft
 mandoc: noarg.in:39:2: WARNING: skipping empty macro: Fa
 mandoc: noarg.in:42:2: WARNING: skipping empty macro: Ft
 mandoc: noarg.in:43:2: WARNING: skipping empty macro: Fn
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: noarg.in:12:10: ERROR: skipping excess arguments: Fo ... bogus
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Fo/nohead.out_lint b/regress/mdoc/Fo/nohead.out_lint
index 2023d0a0..680a05fa 100644
--- a/regress/mdoc/Fo/nohead.out_lint
+++ b/regress/mdoc/Fo/nohead.out_lint
@@ -1,3 +1,4 @@
-mandoc: nohead.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: nohead.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: nohead.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: nohead.in:10:2: WARNING: missing function name, using "": Fo
-mandoc: nohead.in: STYLE: RCS id missing
+mandoc: nohead.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Fo/obsolete.out_lint b/regress/mdoc/Fo/obsolete.out_lint
index 0748a447..6e5d1428 100644
--- a/regress/mdoc/Fo/obsolete.out_lint
+++ b/regress/mdoc/Fo/obsolete.out_lint
@@ -1,4 +1,5 @@
-mandoc: obsolete.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: obsolete.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: obsolete.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: obsolete.in:9:2: WARNING: obsolete macro: Ot
 mandoc: obsolete.in:12:2: WARNING: obsolete macro: Fr
-mandoc: obsolete.in: STYLE: RCS id missing
+mandoc: obsolete.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Fo/punct.out_lint b/regress/mdoc/Fo/punct.out_lint
index 0ef4124c..6ada62c2 100644
--- a/regress/mdoc/Fo/punct.out_lint
+++ b/regress/mdoc/Fo/punct.out_lint
@@ -1,5 +1,6 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd May
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd May (OpenBSD)
 mandoc: punct.in:9:8: STYLE: no blank before trailing delimiter: Fn sin.
 mandoc: punct.in:11:12: STYLE: no blank before trailing delimiter: Fa y:
 mandoc: punct.in:13:18: STYLE: no blank before trailing delimiter: Ft float:
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Fo/warn.out_lint b/regress/mdoc/Fo/warn.out_lint
index 39ddeeb2..4b4324c3 100644
--- a/regress/mdoc/Fo/warn.out_lint
+++ b/regress/mdoc/Fo/warn.out_lint
@@ -1,4 +1,5 @@
-mandoc: warn.in:1:5: STYLE: Mdocdate missing: Dd October
+mandoc: warn.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: warn.in:1:5: BASE: Mdocdate missing: Dd October (OpenBSD)
 mandoc: warn.in:9:8: WARNING: parenthesis in function name: sin()
 mandoc: warn.in:13:19: WARNING: comma in function argument: double y, double x
-mandoc: warn.in: STYLE: RCS id missing
+mandoc: warn.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Ic/noarg.out_lint b/regress/mdoc/Ic/noarg.out_lint
index 01931a83..8541b7df 100644
--- a/regress/mdoc/Ic/noarg.out_lint
+++ b/regress/mdoc/Ic/noarg.out_lint
@@ -1,4 +1,5 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Ic
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: noarg.in:9:7: STYLE: no blank before trailing delimiter: Ic ls.
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/In/noarg.out_lint b/regress/mdoc/In/noarg.out_lint
index f1a550cd..c9037ca8 100644
--- a/regress/mdoc/In/noarg.out_lint
+++ b/regress/mdoc/In/noarg.out_lint
@@ -1,5 +1,6 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: In
 mandoc: noarg.in:18:2: WARNING: skipping empty macro: In
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: noarg.in:15:11: STYLE: no blank before trailing delimiter: In math.h:
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Lb/badargs.out_lint b/regress/mdoc/Lb/badargs.out_lint
index b4832bf3..cb7639ef 100644
--- a/regress/mdoc/Lb/badargs.out_lint
+++ b/regress/mdoc/Lb/badargs.out_lint
@@ -1,7 +1,8 @@
 mandoc: badargs.in:9:2: WARNING: skipping empty macro: Lb
-mandoc: badargs.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: badargs.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badargs.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: badargs.in:8:10: STYLE: no blank before trailing delimiter: Lb murks.
 mandoc: badargs.in:8:5: WARNING: unknown library name: Lb murks.
 mandoc: badargs.in:10:18: STYLE: no blank before trailing delimiter: Lb ... another.
 mandoc: badargs.in:10:5: WARNING: unknown library name: Lb mylib
-mandoc: badargs.in: STYLE: RCS id missing
+mandoc: badargs.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Li/punct.out_lint b/regress/mdoc/Li/punct.out_lint
index 13db2724..8161ef43 100644
--- a/regress/mdoc/Li/punct.out_lint
+++ b/regress/mdoc/Li/punct.out_lint
@@ -23,6 +23,7 @@ mandoc: punct.in:71:7: WARNING: skipping empty macro: Li
 mandoc: punct.in:74:7: WARNING: skipping empty macro: Li
 mandoc: punct.in:75:7: WARNING: skipping empty macro: Li
 mandoc: punct.in:83:2: WARNING: skipping empty macro: Li
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:86:6: STYLE: no blank before trailing delimiter: Li a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Lk/noarg.out_lint b/regress/mdoc/Lk/noarg.out_lint
index 4a49a4f9..aac9e785 100644
--- a/regress/mdoc/Lk/noarg.out_lint
+++ b/regress/mdoc/Lk/noarg.out_lint
@@ -1,5 +1,6 @@
 mandoc: noarg.in:16:2: WARNING: skipping empty macro: Lk
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: noarg.in:12:33: STYLE: no blank before trailing delimiter: Lk ... mandoc,
 mandoc: noarg.in:14:28: STYLE: no blank before trailing delimiter: Lk http://www.openbsd.org/,
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Ms/noarg.out_lint b/regress/mdoc/Ms/noarg.out_lint
index c1a4112a..3658876b 100644
--- a/regress/mdoc/Ms/noarg.out_lint
+++ b/regress/mdoc/Ms/noarg.out_lint
@@ -1,4 +1,5 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Ms
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: noarg.in:9:10: STYLE: no blank before trailing delimiter: Ms alpha.
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Mt/simple.out_lint b/regress/mdoc/Mt/simple.out_lint
index 14aceb51..37de8d0d 100644
--- a/regress/mdoc/Mt/simple.out_lint
+++ b/regress/mdoc/Mt/simple.out_lint
@@ -1,3 +1,4 @@
-mandoc: simple.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: simple.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: simple.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: simple.in:12:26: STYLE: no blank before trailing delimiter: Mt punctuation@localhost.
-mandoc: simple.in: STYLE: RCS id missing
+mandoc: simple.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nd/broken.out_lint b/regress/mdoc/Nd/broken.out_lint
index 977ffbad..21b84782 100644
--- a/regress/mdoc/Nd/broken.out_lint
+++ b/regress/mdoc/Nd/broken.out_lint
@@ -1,5 +1,6 @@
 mandoc: broken.in:28:11: WARNING: blocks badly nested: Bo breaks Pq
-mandoc: broken.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: broken.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: broken.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: broken.in:5:2: WARNING: bad NAME section content: Oo
 mandoc: broken.in:9:1: WARNING: bad NAME section content: text
 mandoc: broken.in:4:2: WARNING: NAME section without Nm before Nd
@@ -8,4 +9,4 @@ mandoc: broken.in:16:2: WARNING: description line outside NAME section: Nd
 mandoc: broken.in:13:2: WARNING: moving content out of list: Bl
 mandoc: broken.in:18:1: WARNING: moving content out of list: text
 mandoc: broken.in:27:2: WARNING: description line outside NAME section: Nd
-mandoc: broken.in: STYLE: RCS id missing
+mandoc: broken.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nd/noarg.out_lint b/regress/mdoc/Nd/noarg.out_lint
index b5d85196..d3fa554d 100644
--- a/regress/mdoc/Nd/noarg.out_lint
+++ b/regress/mdoc/Nd/noarg.out_lint
@@ -1,3 +1,4 @@
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd January
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
 mandoc: noarg.in:6:2: WARNING: missing description line, using "": Nd
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nm/badNAME.out_lint b/regress/mdoc/Nm/badNAME.out_lint
index e15a51ba..21dd2c1b 100644
--- a/regress/mdoc/Nm/badNAME.out_lint
+++ b/regress/mdoc/Nm/badNAME.out_lint
@@ -1,4 +1,5 @@
-mandoc: badNAME.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: badNAME.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badNAME.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: badNAME.in:5:2: ERROR: missing manual name, using "": Nm
 mandoc: badNAME.in:5:5: WARNING: bad NAME section content: Bx
-mandoc: badNAME.in: STYLE: RCS id missing
+mandoc: badNAME.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nm/badNAMEuse.out_lint b/regress/mdoc/Nm/badNAMEuse.out_lint
index 86eadb46..4c378691 100644
--- a/regress/mdoc/Nm/badNAMEuse.out_lint
+++ b/regress/mdoc/Nm/badNAMEuse.out_lint
@@ -1,4 +1,5 @@
-mandoc: badNAMEuse.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: badNAMEuse.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badNAMEuse.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: badNAMEuse.in:5:2: ERROR: missing manual name, using "": Nm
 mandoc: badNAMEuse.in:5:5: WARNING: bad NAME section content: Bx
-mandoc: badNAMEuse.in: STYLE: RCS id missing
+mandoc: badNAMEuse.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nm/break.out_lint b/regress/mdoc/Nm/break.out_lint
index b3c6da7a..69c1cd5a 100644
--- a/regress/mdoc/Nm/break.out_lint
+++ b/regress/mdoc/Nm/break.out_lint
@@ -1,3 +1,4 @@
 mandoc: break.in:9:2: ERROR: inserting missing end of block: Sh breaks Bo
-mandoc: break.in:1:5: STYLE: Mdocdate missing: Dd August
-mandoc: break.in: STYLE: RCS id missing
+mandoc: break.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: break.in:1:5: BASE: Mdocdate missing: Dd August (OpenBSD)
+mandoc: break.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nm/broken.out_lint b/regress/mdoc/Nm/broken.out_lint
index 1d7a95b5..89f51c41 100644
--- a/regress/mdoc/Nm/broken.out_lint
+++ b/regress/mdoc/Nm/broken.out_lint
@@ -1,4 +1,5 @@
 mandoc: broken.in:17:2: WARNING: blocks badly nested: Oo breaks Bk
-mandoc: broken.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: broken.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: broken.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: broken.in:13:2: WARNING: moving content out of list: Oo
-mandoc: broken.in: STYLE: RCS id missing
+mandoc: broken.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Nm/punct.out_lint b/regress/mdoc/Nm/punct.out_lint
index fb6b98b1..e88b2f57 100644
--- a/regress/mdoc/Nm/punct.out_lint
+++ b/regress/mdoc/Nm/punct.out_lint
@@ -1,3 +1,4 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:42:13: STYLE: no blank before trailing delimiter: Nm Nm-punct.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/No/punct.out_lint b/regress/mdoc/No/punct.out_lint
index b816b739..6550bd3c 100644
--- a/regress/mdoc/No/punct.out_lint
+++ b/regress/mdoc/No/punct.out_lint
@@ -23,5 +23,6 @@ mandoc: punct.in:71:7: WARNING: skipping empty macro: No
 mandoc: punct.in:74:7: WARNING: skipping empty macro: No
 mandoc: punct.in:75:7: WARNING: skipping empty macro: No
 mandoc: punct.in:83:2: WARNING: skipping empty macro: No
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Ns/position.out_lint b/regress/mdoc/Ns/position.out_lint
index 2137914d..91695895 100644
--- a/regress/mdoc/Ns/position.out_lint
+++ b/regress/mdoc/Ns/position.out_lint
@@ -1,3 +1,4 @@
-mandoc: position.in:1:5: STYLE: Mdocdate missing: Dd September
+mandoc: position.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: position.in:1:5: BASE: Mdocdate missing: Dd September (OpenBSD)
 mandoc: position.in:10:2: WARNING: skipping no-space macro
-mandoc: position.in: STYLE: RCS id missing
+mandoc: position.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Oo/punct.out_lint b/regress/mdoc/Oo/punct.out_lint
index 43365184..7c58b0c8 100644
--- a/regress/mdoc/Oo/punct.out_lint
+++ b/regress/mdoc/Oo/punct.out_lint
@@ -1,3 +1,4 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:26:6: STYLE: no blank before trailing delimiter: Oo a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Op/break.out_lint b/regress/mdoc/Op/break.out_lint
index bd010c5e..e25d975f 100644
--- a/regress/mdoc/Op/break.out_lint
+++ b/regress/mdoc/Op/break.out_lint
@@ -1,5 +1,6 @@
 mandoc: break.in:9:2: WARNING: blocks badly nested: Op breaks Do
 mandoc: break.in:15:7: WARNING: blocks badly nested: Op breaks Do
 mandoc: break.in:15:2: WARNING: blocks badly nested: Op breaks Do
-mandoc: break.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: break.in: STYLE: RCS id missing
+mandoc: break.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: break.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: break.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Op/broken.out_lint b/regress/mdoc/Op/broken.out_lint
index 409d339e..2a4ca2c3 100644
--- a/regress/mdoc/Op/broken.out_lint
+++ b/regress/mdoc/Op/broken.out_lint
@@ -1,4 +1,5 @@
 mandoc: broken.in:10:17: WARNING: blocks badly nested: Do breaks Op
 mandoc: broken.in:15:15: WARNING: blocks badly nested: Do breaks Op
-mandoc: broken.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: broken.in: STYLE: RCS id missing
+mandoc: broken.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: broken.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: broken.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Op/punct.out_lint b/regress/mdoc/Op/punct.out_lint
index a8e2e90e..0e9bbd8a 100644
--- a/regress/mdoc/Op/punct.out_lint
+++ b/regress/mdoc/Op/punct.out_lint
@@ -1,3 +1,4 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:34:6: STYLE: no blank before trailing delimiter: Op a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Os/dupe.out_lint b/regress/mdoc/Os/dupe.out_lint
index a28817ec..6c8d7584 100644
--- a/regress/mdoc/Os/dupe.out_lint
+++ b/regress/mdoc/Os/dupe.out_lint
@@ -1,4 +1,7 @@
+mandoc: dupe.in:2:5: BASE: operating system explicitly specified: Os NetBSD (NetBSD)
 mandoc: dupe.in:3:2: WARNING: prologue macros out of order: Dt after Os
 mandoc: dupe.in:4:2: WARNING: duplicate prologue macro: Os
+mandoc: dupe.in:4:5: BASE: operating system explicitly specified: Os FreeBSD (NetBSD)
 mandoc: dupe.in:10:2: WARNING: duplicate prologue macro: Os
-mandoc: dupe.in: STYLE: RCS id missing
+mandoc: dupe.in:10:5: BASE: operating system explicitly specified: Os OpenBSD (NetBSD)
+mandoc: dupe.in: BASE: RCS id missing: (NetBSD)
diff --git a/regress/mdoc/Os/late.out_lint b/regress/mdoc/Os/late.out_lint
index 55a4e830..d236b54e 100644
--- a/regress/mdoc/Os/late.out_lint
+++ b/regress/mdoc/Os/late.out_lint
@@ -1,2 +1,3 @@
 mandoc: late.in:8:2: WARNING: late prologue macro: Os
-mandoc: late.in: STYLE: RCS id missing
+mandoc: late.in:8:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: late.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Pa/punct.out_lint b/regress/mdoc/Pa/punct.out_lint
index 50fb6767..6b856085 100644
--- a/regress/mdoc/Pa/punct.out_lint
+++ b/regress/mdoc/Pa/punct.out_lint
@@ -1,3 +1,4 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:45:6: STYLE: no blank before trailing delimiter: Pa a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Pf/spacing.out_lint b/regress/mdoc/Pf/spacing.out_lint
index f77cb443..7389a8c5 100644
--- a/regress/mdoc/Pf/spacing.out_lint
+++ b/regress/mdoc/Pf/spacing.out_lint
@@ -1,5 +1,6 @@
 mandoc: spacing.in:24:2: WARNING: nothing follows prefix: Pf prefixed
 mandoc: spacing.in:27:9: WARNING: nothing follows prefix: Pf .
 mandoc: spacing.in:31:9: WARNING: nothing follows prefix: Pf at eol
-mandoc: spacing.in:1:5: STYLE: Mdocdate missing: Dd November
-mandoc: spacing.in: STYLE: RCS id missing
+mandoc: spacing.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: spacing.in:1:5: BASE: Mdocdate missing: Dd November (OpenBSD)
+mandoc: spacing.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Pp/arg.out_lint b/regress/mdoc/Pp/arg.out_lint
index 442f7362..9c89e1a5 100644
--- a/regress/mdoc/Pp/arg.out_lint
+++ b/regress/mdoc/Pp/arg.out_lint
@@ -1,5 +1,6 @@
 mandoc: arg.in:11:5: ERROR: skipping all arguments: br drop this
 mandoc: arg.in:13:8: ERROR: skipping excess arguments: sp ... drop this
-mandoc: arg.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: arg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: arg.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: arg.in:9:2: ERROR: skipping all arguments: Pp drop
-mandoc: arg.in: STYLE: RCS id missing
+mandoc: arg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Qq/empty.out_lint b/regress/mdoc/Qq/empty.out_lint
index 9b1eb493..a7d35f92 100644
--- a/regress/mdoc/Qq/empty.out_lint
+++ b/regress/mdoc/Qq/empty.out_lint
@@ -1,4 +1,5 @@
-mandoc: empty.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: empty.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: empty.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: empty.in:11:18: STYLE: no blank before trailing delimiter: Qq user@host)
 mandoc: empty.in:14:13: STYLE: no blank before trailing delimiter: Qo full)
-mandoc: empty.in: STYLE: RCS id missing
+mandoc: empty.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Rs/allch.out_lint b/regress/mdoc/Rs/allch.out_lint
index 543d7463..bd38aeff 100644
--- a/regress/mdoc/Rs/allch.out_lint
+++ b/regress/mdoc/Rs/allch.out_lint
@@ -1,8 +1,9 @@
-mandoc: allch.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: allch.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: allch.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: allch.in:14:1: WARNING: invalid content in Rs block: text
 mandoc: allch.in:19:2: WARNING: invalid content in Rs block: Em
 mandoc: allch.in:20:1: WARNING: invalid content in Rs block: text
 mandoc: allch.in:35:1: WARNING: invalid content in Rs block: text
 mandoc: allch.in:36:2: WARNING: invalid content in Rs block: Em
 mandoc: allch.in:41:1: WARNING: invalid content in Rs block: text
-mandoc: allch.in: STYLE: RCS id missing
+mandoc: allch.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Rs/args.out_lint b/regress/mdoc/Rs/args.out_lint
index b9000151..42b56e6a 100644
--- a/regress/mdoc/Rs/args.out_lint
+++ b/regress/mdoc/Rs/args.out_lint
@@ -1,4 +1,5 @@
 mandoc: args.in:9:5: ERROR: skipping all arguments: Rs bogus
 mandoc: args.in:14:5: ERROR: skipping all arguments: Rs Sy
-mandoc: args.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: args.in: STYLE: RCS id missing
+mandoc: args.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: args.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: args.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Rs/empty.out_lint b/regress/mdoc/Rs/empty.out_lint
index 01216631..ee4c4d22 100644
--- a/regress/mdoc/Rs/empty.out_lint
+++ b/regress/mdoc/Rs/empty.out_lint
@@ -1,4 +1,5 @@
-mandoc: empty.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: empty.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: empty.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: empty.in:9:2: WARNING: empty reference block: Rs
 mandoc: empty.in:14:2: WARNING: empty reference block: Rs
-mandoc: empty.in: STYLE: RCS id missing
+mandoc: empty.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Rv/noname.out_lint b/regress/mdoc/Rv/noname.out_lint
index 22c61e44..389ccb7e 100644
--- a/regress/mdoc/Rv/noname.out_lint
+++ b/regress/mdoc/Rv/noname.out_lint
@@ -1,3 +1,4 @@
-mandoc: noname.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: noname.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noname.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: noname.in:5:2: ERROR: missing manual name, using "": Nm
-mandoc: noname.in: STYLE: RCS id missing
+mandoc: noname.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Rv/nostd.out_lint b/regress/mdoc/Rv/nostd.out_lint
index 5337e00d..e13378c2 100644
--- a/regress/mdoc/Rv/nostd.out_lint
+++ b/regress/mdoc/Rv/nostd.out_lint
@@ -1,5 +1,6 @@
-mandoc: nostd.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: nostd.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: nostd.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: nostd.in:9:2: WARNING: missing -std argument, adding it: Rv
 mandoc: nostd.in:12:2: WARNING: missing -std argument, adding it: Rv
 mandoc: nostd.in:15:2: WARNING: missing -std argument, adding it: Rv
-mandoc: nostd.in: STYLE: RCS id missing
+mandoc: nostd.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/badNAME.out_lint b/regress/mdoc/Sh/badNAME.out_lint
index 8ea4f1c0..76387c0d 100644
--- a/regress/mdoc/Sh/badNAME.out_lint
+++ b/regress/mdoc/Sh/badNAME.out_lint
@@ -1,4 +1,5 @@
-mandoc: badNAME.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: badNAME.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badNAME.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: badNAME.in:5:2: WARNING: bad NAME section content: Em
 mandoc: badNAME.in:4:2: WARNING: NAME section without description
-mandoc: badNAME.in: STYLE: RCS id missing
+mandoc: badNAME.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/before.out_lint b/regress/mdoc/Sh/before.out_lint
index b0a48836..f92de650 100644
--- a/regress/mdoc/Sh/before.out_lint
+++ b/regress/mdoc/Sh/before.out_lint
@@ -1,3 +1,4 @@
-mandoc: before.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: before.in: STYLE: RCS id missing
+mandoc: before.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: before.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: before.in: BASE: RCS id missing: (OpenBSD)
 mandoc: before.in:4:1: WARNING: content before first section header: text
diff --git a/regress/mdoc/Sh/empty.out_lint b/regress/mdoc/Sh/empty.out_lint
index 8f3b54fc..1a4bf7ee 100644
--- a/regress/mdoc/Sh/empty.out_lint
+++ b/regress/mdoc/Sh/empty.out_lint
@@ -1,3 +1,4 @@
 mandoc: empty.in:9:2: ERROR: inserting missing end of block: Sh breaks Xo
-mandoc: empty.in:1:5: STYLE: Mdocdate missing: Dd November
-mandoc: empty.in: STYLE: RCS id missing
+mandoc: empty.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: empty.in:1:5: BASE: Mdocdate missing: Dd November (OpenBSD)
+mandoc: empty.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/emptyNAME.out_lint b/regress/mdoc/Sh/emptyNAME.out_lint
index f817d3dd..04d45e5e 100644
--- a/regress/mdoc/Sh/emptyNAME.out_lint
+++ b/regress/mdoc/Sh/emptyNAME.out_lint
@@ -1,4 +1,5 @@
-mandoc: emptyNAME.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: emptyNAME.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: emptyNAME.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: emptyNAME.in:4:2: WARNING: NAME section without Nm before Nd
 mandoc: emptyNAME.in:4:2: WARNING: NAME section without description
-mandoc: emptyNAME.in: STYLE: RCS id missing
+mandoc: emptyNAME.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/first.out_lint b/regress/mdoc/Sh/first.out_lint
index 87169e58..a09b5d61 100644
--- a/regress/mdoc/Sh/first.out_lint
+++ b/regress/mdoc/Sh/first.out_lint
@@ -1,3 +1,4 @@
-mandoc: first.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: first.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: first.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: first.in:4:2: WARNING: first section is not "NAME": Sh DESCRIPTION
-mandoc: first.in: STYLE: RCS id missing
+mandoc: first.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/nohead.out_lint b/regress/mdoc/Sh/nohead.out_lint
index c40bf929..39267b9a 100644
--- a/regress/mdoc/Sh/nohead.out_lint
+++ b/regress/mdoc/Sh/nohead.out_lint
@@ -1,4 +1,5 @@
 mandoc: nohead.in:9:2: WARNING: skipping empty macro: Sh
 mandoc: nohead.in:11:2: WARNING: skipping empty macro: Ss
-mandoc: nohead.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: nohead.in: STYLE: RCS id missing
+mandoc: nohead.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: nohead.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: nohead.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/order.out_lint b/regress/mdoc/Sh/order.out_lint
index 33ca5b26..c7d4b540 100644
--- a/regress/mdoc/Sh/order.out_lint
+++ b/regress/mdoc/Sh/order.out_lint
@@ -1,5 +1,6 @@
-mandoc: order.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: order.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: order.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: order.in:9:2: WARNING: sections out of conventional order: Sh SYNOPSIS
 mandoc: order.in:10:2: WARNING: duplicate section title: Sh SYNOPSIS
 mandoc: order.in:11:2: WARNING: unexpected section: Sh ERRORS for 2, 3, 4, 9 only
-mandoc: order.in: STYLE: RCS id missing
+mandoc: order.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/orderNAME.out_lint b/regress/mdoc/Sh/orderNAME.out_lint
index 269761ef..0f9290f2 100644
--- a/regress/mdoc/Sh/orderNAME.out_lint
+++ b/regress/mdoc/Sh/orderNAME.out_lint
@@ -1,4 +1,5 @@
-mandoc: orderNAME.in:1:5: STYLE: Mdocdate missing: Dd January
+mandoc: orderNAME.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: orderNAME.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
 mandoc: orderNAME.in:5:2: WARNING: description not at the end of NAME
 mandoc: orderNAME.in:4:2: WARNING: NAME section without Nm before Nd
-mandoc: orderNAME.in: STYLE: RCS id missing
+mandoc: orderNAME.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/parbefore.out_lint b/regress/mdoc/Sh/parbefore.out_lint
index bbb4ec84..a42853d8 100644
--- a/regress/mdoc/Sh/parbefore.out_lint
+++ b/regress/mdoc/Sh/parbefore.out_lint
@@ -1,3 +1,4 @@
-mandoc: parbefore.in:1:5: STYLE: Mdocdate missing: Dd April
+mandoc: parbefore.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: parbefore.in:1:5: BASE: Mdocdate missing: Dd April (OpenBSD)
 mandoc: parbefore.in:4:2: WARNING: skipping paragraph macro: Pp before Sh
-mandoc: parbefore.in: STYLE: RCS id missing
+mandoc: parbefore.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/parborder.out_lint b/regress/mdoc/Sh/parborder.out_lint
index c6a32d8f..704b4b76 100644
--- a/regress/mdoc/Sh/parborder.out_lint
+++ b/regress/mdoc/Sh/parborder.out_lint
@@ -1,4 +1,5 @@
-mandoc: parborder.in:1:5: STYLE: Mdocdate missing: Dd April
+mandoc: parborder.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: parborder.in:1:5: BASE: Mdocdate missing: Dd April (OpenBSD)
 mandoc: parborder.in:8:2: WARNING: skipping paragraph macro: Pp after Sh
 mandoc: parborder.in:10:2: WARNING: skipping paragraph macro: Pp at the end of Sh
 mandoc: parborder.in:12:2: WARNING: skipping paragraph macro: Pp after Sh
@@ -6,4 +7,4 @@ mandoc: parborder.in:16:2: WARNING: skipping paragraph macro: Pp after Ss
 mandoc: parborder.in:18:2: WARNING: skipping paragraph macro: Pp at the end of Ss
 mandoc: parborder.in:14:2: WARNING: skipping paragraph macro: Pp before Ss
 mandoc: parborder.in:21:2: WARNING: skipping paragraph macro: Pp at the end of Ss
-mandoc: parborder.in: STYLE: RCS id missing
+mandoc: parborder.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/punctNAME.out_lint b/regress/mdoc/Sh/punctNAME.out_lint
index 845c22d9..6c7a0c38 100644
--- a/regress/mdoc/Sh/punctNAME.out_lint
+++ b/regress/mdoc/Sh/punctNAME.out_lint
@@ -1,6 +1,7 @@
-mandoc: punctNAME.in:1:5: STYLE: Mdocdate missing: Dd January
+mandoc: punctNAME.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punctNAME.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
 mandoc: punctNAME.in:6:2: WARNING: missing comma before name: Nm second_name
 mandoc: punctNAME.in:6:17: WARNING: bad NAME section content: text
 mandoc: punctNAME.in:7:2: WARNING: missing comma before name: Nm third_name
 mandoc: punctNAME.in:7:16: WARNING: bad NAME section content: text
-mandoc: punctNAME.in: STYLE: RCS id missing
+mandoc: punctNAME.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sh/subbefore.out_lint b/regress/mdoc/Sh/subbefore.out_lint
index 94164e51..6450e41e 100644
--- a/regress/mdoc/Sh/subbefore.out_lint
+++ b/regress/mdoc/Sh/subbefore.out_lint
@@ -1,3 +1,4 @@
-mandoc: subbefore.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: subbefore.in: STYLE: RCS id missing
+mandoc: subbefore.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: subbefore.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: subbefore.in: BASE: RCS id missing: (OpenBSD)
 mandoc: subbefore.in:4:2: WARNING: content before first section header: Ss
diff --git a/regress/mdoc/Sm/badarg.out_lint b/regress/mdoc/Sm/badarg.out_lint
index ade29650..4179fa10 100644
--- a/regress/mdoc/Sm/badarg.out_lint
+++ b/regress/mdoc/Sm/badarg.out_lint
@@ -1,4 +1,5 @@
-mandoc: badarg.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: badarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badarg.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: badarg.in:11:5: WARNING: invalid Boolean argument: Sm bad
 mandoc: badarg.in:13:5: WARNING: invalid Boolean argument: Sm bad
-mandoc: badarg.in: STYLE: RCS id missing
+mandoc: badarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sm/twoarg.out_lint b/regress/mdoc/Sm/twoarg.out_lint
index a65f88a6..a1d3ca00 100644
--- a/regress/mdoc/Sm/twoarg.out_lint
+++ b/regress/mdoc/Sm/twoarg.out_lint
@@ -1,3 +1,4 @@
-mandoc: twoarg.in:1:5: STYLE: Mdocdate missing: Dd November
+mandoc: twoarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: twoarg.in:1:5: BASE: Mdocdate missing: Dd November (OpenBSD)
 mandoc: twoarg.in:16:5: WARNING: invalid Boolean argument: Sm bad
-mandoc: twoarg.in: STYLE: RCS id missing
+mandoc: twoarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sq/empty.out_lint b/regress/mdoc/Sq/empty.out_lint
index e2edf0c8..1fbf21ec 100644
--- a/regress/mdoc/Sq/empty.out_lint
+++ b/regress/mdoc/Sq/empty.out_lint
@@ -1,4 +1,5 @@
-mandoc: empty.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: empty.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: empty.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: empty.in:11:18: STYLE: no blank before trailing delimiter: Sq user@host)
 mandoc: empty.in:14:13: STYLE: no blank before trailing delimiter: So full)
-mandoc: empty.in: STYLE: RCS id missing
+mandoc: empty.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/St/badargs.out_lint b/regress/mdoc/St/badargs.out_lint
index 91b756d2..cfa6f53a 100644
--- a/regress/mdoc/St/badargs.out_lint
+++ b/regress/mdoc/St/badargs.out_lint
@@ -1,4 +1,5 @@
 mandoc: badargs.in:15:2: WARNING: skipping empty macro: St
-mandoc: badargs.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: badargs.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badargs.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: badargs.in:12:5: ERROR: unknown standard specifier: St -murks
-mandoc: badargs.in: STYLE: RCS id missing
+mandoc: badargs.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/St/call.out_lint b/regress/mdoc/St/call.out_lint
index c92fffcc..bea3c048 100644
--- a/regress/mdoc/St/call.out_lint
+++ b/regress/mdoc/St/call.out_lint
@@ -1,3 +1,4 @@
 mandoc: call.in:9:2: WARNING: skipping empty macro: St
-mandoc: call.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: call.in: STYLE: RCS id missing
+mandoc: call.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: call.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: call.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sx/noarg.out_lint b/regress/mdoc/Sx/noarg.out_lint
index f2bd60f0..1b6b909b 100644
--- a/regress/mdoc/Sx/noarg.out_lint
+++ b/regress/mdoc/Sx/noarg.out_lint
@@ -1,3 +1,4 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Sx
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd January
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sy/noarg.out_lint b/regress/mdoc/Sy/noarg.out_lint
index d51488d3..efa9587b 100644
--- a/regress/mdoc/Sy/noarg.out_lint
+++ b/regress/mdoc/Sy/noarg.out_lint
@@ -1,3 +1,4 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Sy
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd January
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Sy/punct.out_lint b/regress/mdoc/Sy/punct.out_lint
index 0339065d..cc97329e 100644
--- a/regress/mdoc/Sy/punct.out_lint
+++ b/regress/mdoc/Sy/punct.out_lint
@@ -23,6 +23,7 @@ mandoc: punct.in:71:7: WARNING: skipping empty macro: Sy
 mandoc: punct.in:74:7: WARNING: skipping empty macro: Sy
 mandoc: punct.in:75:7: WARNING: skipping empty macro: Sy
 mandoc: punct.in:83:2: WARNING: skipping empty macro: Sy
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:86:6: STYLE: no blank before trailing delimiter: Sy a.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Tn/noarg.out_lint b/regress/mdoc/Tn/noarg.out_lint
index 07ebd6c9..44a0c9f8 100644
--- a/regress/mdoc/Tn/noarg.out_lint
+++ b/regress/mdoc/Tn/noarg.out_lint
@@ -1,4 +1,5 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Tn
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd January
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
 mandoc: noarg.in:9:2: STYLE: useless macro: Tn
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Ud/arg.out_lint b/regress/mdoc/Ud/arg.out_lint
index d146f650..654620b3 100644
--- a/regress/mdoc/Ud/arg.out_lint
+++ b/regress/mdoc/Ud/arg.out_lint
@@ -1,4 +1,5 @@
-mandoc: arg.in:1:5: STYLE: Mdocdate missing: Dd January
+mandoc: arg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: arg.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
 mandoc: arg.in:9:2: STYLE: useless macro: Ud
 mandoc: arg.in:11:2: STYLE: useless macro: Bt
 mandoc: arg.in:15:2: STYLE: useless macro: Ud
@@ -9,4 +10,4 @@ mandoc: arg.in:17:2: STYLE: useless macro: Ud
 mandoc: arg.in:17:2: ERROR: skipping all arguments: Ud one
 mandoc: arg.in:18:2: STYLE: useless macro: Bt
 mandoc: arg.in:18:2: ERROR: skipping all arguments: Bt one
-mandoc: arg.in: STYLE: RCS id missing
+mandoc: arg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Ux/punct.out_lint b/regress/mdoc/Ux/punct.out_lint
index 9aa26936..eed093e4 100644
--- a/regress/mdoc/Ux/punct.out_lint
+++ b/regress/mdoc/Ux/punct.out_lint
@@ -1,7 +1,8 @@
-mandoc: punct.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: punct.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: punct.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: punct.in:10:9: STYLE: no blank before trailing delimiter: Bsx 5.1,
 mandoc: punct.in:11:10: STYLE: no blank before trailing delimiter: Dx 4.8.0,
 mandoc: punct.in:12:9: STYLE: no blank before trailing delimiter: Fx 11.0,
 mandoc: punct.in:13:8: STYLE: no blank before trailing delimiter: Nx 7.1,
 mandoc: punct.in:15:8: STYLE: no blank before trailing delimiter: Ox 6.1.
-mandoc: punct.in: STYLE: RCS id missing
+mandoc: punct.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Va/noarg.out_lint b/regress/mdoc/Va/noarg.out_lint
index dc7dad6b..aa8cac5a 100644
--- a/regress/mdoc/Va/noarg.out_lint
+++ b/regress/mdoc/Va/noarg.out_lint
@@ -1,4 +1,5 @@
 mandoc: noarg.in:12:2: WARNING: skipping empty macro: Va
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: noarg.in:10:10: STYLE: no blank before trailing delimiter: Va errno.
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Vt/noarg.out_lint b/regress/mdoc/Vt/noarg.out_lint
index bdc95705..410fb096 100644
--- a/regress/mdoc/Vt/noarg.out_lint
+++ b/regress/mdoc/Vt/noarg.out_lint
@@ -1,4 +1,5 @@
 mandoc: noarg.in:11:2: WARNING: skipping empty macro: Vt
-mandoc: noarg.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: noarg.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: noarg.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: noarg.in:9:15: STYLE: no blank before trailing delimiter: Vt ... int.
-mandoc: noarg.in: STYLE: RCS id missing
+mandoc: noarg.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/Xr/args.out_lint b/regress/mdoc/Xr/args.out_lint
index 6a1b71db..cc734119 100644
--- a/regress/mdoc/Xr/args.out_lint
+++ b/regress/mdoc/Xr/args.out_lint
@@ -1,8 +1,9 @@
 mandoc: args.in:28:2: WARNING: skipping empty macro: Xr
 mandoc: args.in:30:2: WARNING: skipping empty macro: Xr
-mandoc: args.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: args.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: args.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: args.in:22:13: STYLE: no blank before trailing delimiter: Xr ... 1)
 mandoc: args.in:24:2: WARNING: missing section argument: Xr echo
 mandoc: args.in:26:2: WARNING: missing section argument: Xr echo,
 mandoc: args.in:26:9: STYLE: no blank before trailing delimiter: Xr echo,
-mandoc: args.in: STYLE: RCS id missing
+mandoc: args.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/blank/comment.out_lint b/regress/mdoc/blank/comment.out_lint
index bbecdd2d..33ef6045 100644
--- a/regress/mdoc/blank/comment.out_lint
+++ b/regress/mdoc/blank/comment.out_lint
@@ -1,3 +1,4 @@
 mandoc: comment.in:11:3: WARNING: bad comment style
-mandoc: comment.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: comment.in: STYLE: RCS id missing
+mandoc: comment.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: comment.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: comment.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/blank/line.out_lint b/regress/mdoc/blank/line.out_lint
index b427a12a..c83e766c 100644
--- a/regress/mdoc/blank/line.out_lint
+++ b/regress/mdoc/blank/line.out_lint
@@ -7,7 +7,8 @@ mandoc: line.in:60:1: WARNING: blank line in fill mode, using .sp
 mandoc: line.in:62:1: WARNING: blank line in fill mode, using .sp
 mandoc: line.in:65:1: WARNING: blank line in fill mode, using .sp
 mandoc: line.in:66:1: WARNING: blank line in fill mode, using .sp
-mandoc: line.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: line.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: line.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: line.in:18:2: WARNING: skipping paragraph macro: br after br
 mandoc: line.in:20:2: WARNING: skipping paragraph macro: br before Pp
 mandoc: line.in:24:2: WARNING: skipping paragraph macro: br after Pp
@@ -22,4 +23,4 @@ mandoc: line.in:83:2: WARNING: skipping paragraph macro: Pp at the end of Sh
 mandoc: line.in:85:2: WARNING: skipping paragraph macro: Pp after Sh
 mandoc: line.in:88:2: WARNING: skipping paragraph macro: Pp after Ss
 mandoc: line.in:90:2: WARNING: skipping paragraph macro: Pp at the end of Ss
-mandoc: line.in: STYLE: RCS id missing
+mandoc: line.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/blank/list.out_lint b/regress/mdoc/blank/list.out_lint
index f49f5f65..cceaa634 100644
--- a/regress/mdoc/blank/list.out_lint
+++ b/regress/mdoc/blank/list.out_lint
@@ -1,4 +1,5 @@
-mandoc: list.in:1:5: STYLE: Mdocdate missing: Dd July
+mandoc: list.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: list.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
 mandoc: list.in:19:2: WARNING: skipping paragraph macro: Pp before It
 mandoc: list.in:22:2: WARNING: moving paragraph macro out of list: Pp
 mandoc: list.in:34:2: WARNING: moving paragraph macro out of list: Pp
@@ -6,4 +7,4 @@ mandoc: list.in:34:2: WARNING: skipping paragraph macro: Pp before Pp
 mandoc: list.in:51:2: WARNING: moving paragraph macro out of list: Pp
 mandoc: list.in:63:2: WARNING: moving paragraph macro out of list: Pp
 mandoc: list.in:63:2: WARNING: skipping paragraph macro: Pp before Pp
-mandoc: list.in: STYLE: RCS id missing
+mandoc: list.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/break/brokenbreaker.out_lint b/regress/mdoc/break/brokenbreaker.out_lint
index 736b2539..7fbf4a5b 100644
--- a/regress/mdoc/break/brokenbreaker.out_lint
+++ b/regress/mdoc/break/brokenbreaker.out_lint
@@ -1,5 +1,6 @@
 mandoc: brokenbreaker.in:10:2: WARNING: blocks badly nested: Po breaks Ao
 mandoc: brokenbreaker.in:12:2: ERROR: skipping end of block that is not open: Pc
 mandoc: brokenbreaker.in:13:2: WARNING: blocks badly nested: Ao breaks Bo
-mandoc: brokenbreaker.in:1:5: STYLE: Mdocdate missing: Dd December
-mandoc: brokenbreaker.in: STYLE: RCS id missing
+mandoc: brokenbreaker.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: brokenbreaker.in:1:5: BASE: Mdocdate missing: Dd December (OpenBSD)
+mandoc: brokenbreaker.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/break/notopen.out_lint b/regress/mdoc/break/notopen.out_lint
index 690c295c..00ac0ee3 100644
--- a/regress/mdoc/break/notopen.out_lint
+++ b/regress/mdoc/break/notopen.out_lint
@@ -1,3 +1,4 @@
 mandoc: notopen.in:10:2: ERROR: skipping end of block that is not open: Pc
-mandoc: notopen.in:1:5: STYLE: Mdocdate missing: Dd August
-mandoc: notopen.in: STYLE: RCS id missing
+mandoc: notopen.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: notopen.in:1:5: BASE: Mdocdate missing: Dd August (OpenBSD)
+mandoc: notopen.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/break/tail.out_lint b/regress/mdoc/break/tail.out_lint
index 5864cc9d..4257cd38 100644
--- a/regress/mdoc/break/tail.out_lint
+++ b/regress/mdoc/break/tail.out_lint
@@ -3,5 +3,6 @@ mandoc: tail.in:15:2: WARNING: blocks badly nested: Ao breaks Bo
 mandoc: tail.in:20:2: WARNING: blocks badly nested: Aq breaks Bo
 mandoc: tail.in:22:2: WARNING: blocks badly nested: Aq breaks Bo
 mandoc: tail.in:46:2: WARNING: blocks badly nested: Bro breaks Po
-mandoc: tail.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: tail.in: STYLE: RCS id missing
+mandoc: tail.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: tail.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: tail.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/break/twice.out_lint b/regress/mdoc/break/twice.out_lint
index 8179ff3b..67faf1c6 100644
--- a/regress/mdoc/break/twice.out_lint
+++ b/regress/mdoc/break/twice.out_lint
@@ -8,6 +8,7 @@ mandoc: twice.in:32:11: WARNING: blocks badly nested: Bo breaks Aq
 mandoc: twice.in:32:17: WARNING: blocks badly nested: Bo breaks Aq
 mandoc: twice.in:36:8: WARNING: blocks badly nested: Bq breaks Po
 mandoc: twice.in:36:2: WARNING: blocks badly nested: Aq breaks Po
-mandoc: twice.in:1:5: STYLE: Mdocdate missing: Dd February
+mandoc: twice.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: twice.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
 mandoc: twice.in:36:2: WARNING: moving content out of list: Aq
-mandoc: twice.in: STYLE: RCS id missing
+mandoc: twice.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/mdoc/break/two.out_lint b/regress/mdoc/break/two.out_lint
index a77ded9d..27929e5f 100644
--- a/regress/mdoc/break/two.out_lint
+++ b/regress/mdoc/break/two.out_lint
@@ -6,5 +6,6 @@ mandoc: two.in:29:2: WARNING: blocks badly nested: Aq breaks Bro
 mandoc: two.in:30:2: WARNING: blocks badly nested: Bo breaks Bro
 mandoc: two.in:36:2: WARNING: blocks badly nested: Ao breaks Bo
 mandoc: two.in:41:2: WARNING: blocks badly nested: Aq breaks Bo
-mandoc: two.in:1:5: STYLE: Mdocdate missing: Dd February
-mandoc: two.in: STYLE: RCS id missing
+mandoc: two.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: two.in:1:5: BASE: Mdocdate missing: Dd February (OpenBSD)
+mandoc: two.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/args/man.out_lint b/regress/roff/args/man.out_lint
index aac49c8a..4642e8d2 100644
--- a/regress/roff/args/man.out_lint
+++ b/regress/roff/args/man.out_lint
@@ -7,4 +7,4 @@ mandoc: man.in:90:27: WARNING: whitespace at end of input line
 mandoc: man.in:103:5: WARNING: unterminated quoted argument
 mandoc: man.in:106:9: WARNING: unterminated quoted argument
 mandoc: man.in:130:1: ERROR: escaped character not allowed in a name: IB\(
-mandoc: man.in: STYLE: RCS id missing
+mandoc: man.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/args/mdoc.out_lint b/regress/roff/args/mdoc.out_lint
index 7c5d10b9..c262f825 100644
--- a/regress/roff/args/mdoc.out_lint
+++ b/regress/roff/args/mdoc.out_lint
@@ -11,5 +11,6 @@ mandoc: mdoc.in:107:14: WARNING: unterminated quoted argument
 mandoc: mdoc.in:111:11: WARNING: unterminated quoted argument
 mandoc: mdoc.in:112:15: WARNING: unterminated quoted argument
 mandoc: mdoc.in:120:1: ERROR: escaped character not allowed in a name: Fl\(
-mandoc: mdoc.in:1:5: STYLE: Mdocdate missing: Dd November
-mandoc: mdoc.in: STYLE: RCS id missing
+mandoc: mdoc.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: mdoc.in:1:5: BASE: Mdocdate missing: Dd November (OpenBSD)
+mandoc: mdoc.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/args/roff.out_lint b/regress/roff/args/roff.out_lint
index e362a4ae..d074d13a 100644
--- a/regress/roff/args/roff.out_lint
+++ b/regress/roff/args/roff.out_lint
@@ -14,4 +14,4 @@ mandoc: roff.in:68:7: WARNING: unterminated quoted argument
 mandoc: roff.in:68:13: WARNING: whitespace at end of input line
 mandoc: roff.in:69:11: WARNING: unterminated quoted argument
 mandoc: roff.in:69:17: WARNING: whitespace at end of input line
-mandoc: roff.in: STYLE: RCS id missing
+mandoc: roff.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/br/args.out_lint b/regress/roff/br/args.out_lint
index a68c3dca..79b1ec82 100644
--- a/regress/roff/br/args.out_lint
+++ b/regress/roff/br/args.out_lint
@@ -1,2 +1,2 @@
 mandoc: args.in:7:5: ERROR: skipping all arguments: br arg1 arg2 arg3
-mandoc: args.in: STYLE: RCS id missing
+mandoc: args.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/cc/basic.out_lint b/regress/roff/cc/basic.out_lint
index ac4e7430..cc46cd95 100644
--- a/regress/roff/cc/basic.out_lint
+++ b/regress/roff/cc/basic.out_lint
@@ -1,2 +1,2 @@
 mandoc: basic.in:12:6: ERROR: skipping excess arguments: cc ... bogus
-mandoc: basic.in: STYLE: RCS id missing
+mandoc: basic.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/cond/close.out_lint b/regress/roff/cond/close.out_lint
index 0c351422..a0954774 100644
--- a/regress/roff/cond/close.out_lint
+++ b/regress/roff/cond/close.out_lint
@@ -1,3 +1,3 @@
 mandoc: close.in:14:2: ERROR: appending missing end of block: if
 mandoc: close.in:14:9: WARNING: skipping paragraph macro: sp after PP
-mandoc: close.in: STYLE: RCS id missing
+mandoc: close.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/cond/if.out_lint b/regress/roff/cond/if.out_lint
index 1b0d70f8..e0934187 100644
--- a/regress/roff/cond/if.out_lint
+++ b/regress/roff/cond/if.out_lint
@@ -1,3 +1,3 @@
 mandoc: if.in:14:2: WARNING: conditional request controls empty scope: if
 mandoc: if.in:16:2: WARNING: conditional request controls empty scope: if
-mandoc: if.in: STYLE: RCS id missing
+mandoc: if.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/de/escname.out_lint b/regress/roff/de/escname.out_lint
index 8805b9d5..3ad59e77 100644
--- a/regress/roff/de/escname.out_lint
+++ b/regress/roff/de/escname.out_lint
@@ -6,5 +6,6 @@ mandoc: escname.in:37:5: ERROR: skipping excess arguments: .de ... excess argume
 mandoc: escname.in:40:1: ERROR: escaped character not allowed in a name: witharg\(
 mandoc: escname.in:42:1: ERROR: escaped character not allowed in a name: de\e
 mandoc: escname.in:42:2: WARNING: skipping empty request: de
-mandoc: escname.in:1:5: STYLE: Mdocdate missing: Dd June
-mandoc: escname.in: STYLE: RCS id missing
+mandoc: escname.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: escname.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
+mandoc: escname.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/de/indir.out_lint b/regress/roff/de/indir.out_lint
index ef900e60..7f1c7f85 100644
--- a/regress/roff/de/indir.out_lint
+++ b/regress/roff/de/indir.out_lint
@@ -2,5 +2,6 @@ mandoc: indir.in:18:11: WARNING: undefined string, using "": myie
 mandoc: indir.in:25:6: WARNING: undefined string, using "": myim
 mandoc: indir.in:25:2: WARNING: skipping empty request: dei
 mandoc: indir.in:29:2: WARNING: skipping empty request: dei
-mandoc: indir.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: indir.in: STYLE: RCS id missing
+mandoc: indir.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: indir.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: indir.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/de/infinite.out_lint b/regress/roff/de/infinite.out_lint
index 2102dbd2..a125e333 100644
--- a/regress/roff/de/infinite.out_lint
+++ b/regress/roff/de/infinite.out_lint
@@ -1,4 +1,5 @@
 mandoc: infinite.in:13:5: ERROR: input stack limit exceeded, infinite loop?
 mandoc: infinite.in:19:5: ERROR: input stack limit exceeded, infinite loop?
-mandoc: infinite.in:1:5: STYLE: Mdocdate missing: Dd March
-mandoc: infinite.in: STYLE: RCS id missing
+mandoc: infinite.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: infinite.in:1:5: BASE: Mdocdate missing: Dd March (OpenBSD)
+mandoc: infinite.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/esc/B.out_lint b/regress/roff/esc/B.out_lint
index 0bd7be65..62deca18 100644
--- a/regress/roff/esc/B.out_lint
+++ b/regress/roff/esc/B.out_lint
@@ -1,3 +1,4 @@
 mandoc: B.in:36:23: WARNING: invalid escape sequence: \B'1+1
-mandoc: B.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: B.in: STYLE: RCS id missing
+mandoc: B.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: B.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: B.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/esc/h.out_lint b/regress/roff/esc/h.out_lint
index 5a12330d..7eb4ea9d 100644
--- a/regress/roff/esc/h.out_lint
+++ b/regress/roff/esc/h.out_lint
@@ -1,3 +1,4 @@
 mandoc: h.in:22:21: WARNING: invalid escape sequence: \h-
-mandoc: h.in:1:5: STYLE: Mdocdate missing: Dd May
-mandoc: h.in: STYLE: RCS id missing
+mandoc: h.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: h.in:1:5: BASE: Mdocdate missing: Dd May (OpenBSD)
+mandoc: h.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/esc/ignore.out_lint b/regress/roff/esc/ignore.out_lint
index 38541635..294b2e86 100644
--- a/regress/roff/esc/ignore.out_lint
+++ b/regress/roff/esc/ignore.out_lint
@@ -1,3 +1,4 @@
 mandoc: ignore.in:14:60: WARNING: invalid escape sequence: \s-
-mandoc: ignore.in:1:5: STYLE: Mdocdate missing: Dd January
-mandoc: ignore.in: STYLE: RCS id missing
+mandoc: ignore.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: ignore.in:1:5: BASE: Mdocdate missing: Dd January (OpenBSD)
+mandoc: ignore.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/esc/l.out_lint b/regress/roff/esc/l.out_lint
index b755b42a..39491db3 100644
--- a/regress/roff/esc/l.out_lint
+++ b/regress/roff/esc/l.out_lint
@@ -1,3 +1,4 @@
 mandoc: l.in:22:21: WARNING: invalid escape sequence: \h-
-mandoc: l.in:1:5: STYLE: Mdocdate missing: Dd June
-mandoc: l.in: STYLE: RCS id missing
+mandoc: l.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: l.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
+mandoc: l.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/esc/w.out_lint b/regress/roff/esc/w.out_lint
index 89073dc7..b31dcdb2 100644
--- a/regress/roff/esc/w.out_lint
+++ b/regress/roff/esc/w.out_lint
@@ -1,3 +1,4 @@
 mandoc: w.in:16:15: WARNING: invalid escape sequence: \w'foo
-mandoc: w.in:1:5: STYLE: Mdocdate missing: Dd April
-mandoc: w.in: STYLE: RCS id missing
+mandoc: w.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: w.in:1:5: BASE: Mdocdate missing: Dd April (OpenBSD)
+mandoc: w.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/ft/badargs-mdoc.out_lint b/regress/roff/ft/badargs-mdoc.out_lint
index 32f62e21..2d159e5d 100644
--- a/regress/roff/ft/badargs-mdoc.out_lint
+++ b/regress/roff/ft/badargs-mdoc.out_lint
@@ -1,4 +1,5 @@
 mandoc: badargs-mdoc.in:13:7: ERROR: skipping excess arguments: ft ... bogus
-mandoc: badargs-mdoc.in:1:5: STYLE: Mdocdate missing: Dd May
+mandoc: badargs-mdoc.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: badargs-mdoc.in:1:5: BASE: Mdocdate missing: Dd May (OpenBSD)
 mandoc: badargs-mdoc.in:11:2: WARNING: unknown font, skipping request: ft foo
-mandoc: badargs-mdoc.in: STYLE: RCS id missing
+mandoc: badargs-mdoc.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/ft/badargs.out_lint b/regress/roff/ft/badargs.out_lint
index 2def370d..7e5957c7 100644
--- a/regress/roff/ft/badargs.out_lint
+++ b/regress/roff/ft/badargs.out_lint
@@ -1,3 +1,3 @@
 mandoc: badargs.in:10:7: ERROR: skipping excess arguments: ft ... bogus
 mandoc: badargs.in:8:2: WARNING: unknown font, skipping request: ft foo
-mandoc: badargs.in: STYLE: RCS id missing
+mandoc: badargs.in: BASE: RCS id missing: (OpenBSD)
diff --git a/regress/roff/ig/basic.out_lint b/regress/roff/ig/basic.out_lint
index fad0e38f..4c07ea8d 100644
--- a/regress/roff/ig/basic.out_lint
+++ b/regress/roff/ig/basic.out_lint
@@ -1,5 +1,6 @@
 mandoc: basic.in:19:5: ERROR: skipping excess arguments: .ig ... excess
 mandoc: basic.in:24:2: ERROR: skipping end of block that is not open: ..
 mandoc: basic.in:26:2: ERROR: appending missing end of block: ig
-mandoc: basic.in:1:5: STYLE: Mdocdate missing: Dd July
-mandoc: basic.in: STYLE: RCS id missing
+mandoc: basic.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: basic.in:1:5: BASE: Mdocdate missing: Dd July (OpenBSD)
+mandoc: basic.in: BASE: RCS id missing: (OpenBSD)