There is _one_ mention of BSD/OS in the manpages
(as that's where getifaddrs() came from),
not counting the meta-occurence in mdoc(7).
That makes it the only opportunity to use the .Bsx macro :-)
Not sure about the other half, but jmc@ is already looking
into the same question for .Bx
Jan
Index: lib/libc/net/getifaddrs.3
===================================================================
RCS file: /cvs/src/lib/libc/net/getifaddrs.3,v
retrieving revision 1.16
diff -u -p -u -p -r1.16 getifaddrs.3
--- lib/libc/net/getifaddrs.3 5 Jun 2013 03:39:23 -0000 1.16
+++ lib/libc/net/getifaddrs.3 14 Aug 2013 09:35:23 -0000
@@ -141,7 +141,8 @@ or
.Sh HISTORY
The
.Fn getifaddrs
-function first appeared in BSDI BSD/OS.
+function first appeared in BSDI
+.Bsx .
The function has been available on
.Ox
since
Index: share/man/man7/mdoc.7
===================================================================
RCS file: /cvs/src/share/man/man7/mdoc.7,v
retrieving revision 1.99
diff -u -p -u -p -r1.99 mdoc.7
--- share/man/man7/mdoc.7 13 Jul 2013 19:27:47 -0000 1.99
+++ share/man/man7/mdoc.7 14 Aug 2013 09:35:24 -0000
@@ -1089,7 +1089,9 @@ Examples:
See also
.Sx \&Bro .
.Ss \&Bsx
-Format the BSD/OS version provided as an argument, or a default value if
+Format the
+.Bsx
+version provided as an argument, or a default value if
no argument is provided.
.Pp
Examples:
