docs/161017: [patch] add a helpful blurb about PORTS_MODULES to build(7)

[gjb at FreeBSD.org]

Synopsis: [patch] add a helpful blurb about PORTS_MODULES to build(7)

State-Changed-From-To: open->patched
State-Changed-By: gjb
State-Changed-When: Thu Sep 29 02:52:50 UTC 2011
State-Changed-Why: 
Patched in HEAD with minor changes.  MFC in 1 week.



Responsible-Changed-From-To: freebsd-bugs->gjb
Responsible-Changed-By: gjb
Responsible-Changed-When: Thu Sep 29 02:52:50 UTC 2011
Responsible-Changed-Why: 
Over to me.


http://www.freebsd.org/cgi/query-pr.cgi?pr=161017