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: BASE: RCS id missing: (OpenBSD)