+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