Provide implementations of `define', `set', and `unset'.

Tie them into the stream of data.
Document these appropriate, bringing in the grammar as defined by the
original eqn manual (Kernighan/Richie).

1 files changed, 3 insertions, 0 deletions

diff --git a/read.c b/read.c
index f8390552..28d53acc 100644
--- a/read.c
+++ b/read.c
@@ -152,6 +152,9 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	
 	"generic error",
 
+	/* related to equations */
+	"bad equation macro syntax",
+
 	/* related to tables */
 	"bad table syntax",
 	"bad table option",