MFC r266416:

------------------------------------------------------------------------
    r266416 | bjk | 2014-05-18 17:05:54 -0400 (Sun, 18 May 2014) | 14 lines

    Document some user-settable make variables in ports.7

    This is not a comprehensive list, as the variables themselves are spread
    out over multiple files, but it is a start.

    Add a section to make.conf noting that variables may be set there that
    affect ports builds, but refer to ports.7 and elsewhere for the actual
    listing; any listing in make.conf.5 would likely become out of date
    fairly quickly.

    PR:             docs/189199
    Reviewed by:    bdrewery (previous version)
    Approved by:    hrs (mentor)

    ------------------------------------------------------------------------

PR:		189199
Approved by:	hrs (mentor)

share/man/man5/make.conf.5

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 2, 2014
+.Dd May 17, 2014
 .Dt MAKE.CONF 5
 .Os
 .Sh NAME
@@ -655,6 +655,14 @@ for simple printers, or
 for postscript or graphics printers with a ghostscript
 filter, or both.
 .El
+.Ss "BUILDING PORTS"
+Several make variables can be set that affect the building of ports.
+These variables and their effects are documented in
+.Xr ports 7 ,
+.Pa ${PORTSDIR}/Mk/*
+and the
+.Fx
+Porter's Handbook.
 .Sh FILES
 .Bl -tag -width ".Pa /usr/share/examples/etc/make.conf" -compact
 .It Pa /etc/make.conf

share/man/man7/ports.7

@@ -486,6 +486,44 @@ have been configured will have a uniquely named sub-directory, containing a
 single file
 .Pa options .
 .El
+.Sh MAKE VARIABLES
+The following list provides a name and short description for many of the
+variables that are used when building ports.
+More information on these and other related variables may be found in
+.Pa ${PORTSDIR}/Mk/*
+and the
+.Fx
+Porter's Handbook.
+.Bl -tag -width ".Va OVERRIDE_LINUX_BASE_PORT"
+.It Va WITH_OPENSSL_PORT
+.Pq Vt bool
+If set, causes ports that make use of OpenSSL to use the OpenSSL from
+ports
+.Pq if available
+instead of the OpenSSL from the base system.
+.It Va WITH_DEBUG
+.Pq Vt bool
+If set, debugging symbols are installed for ports binaries.
+.It Va WITH_DEBUG_PORTS
+A list of origins for which to set
+.Va WITH_DEBUG_PORTS .
+.It Va WITH_SSP_PORTS
+.Pq Vt bool
+If set, enables
+.Fl fstack-protector
+for most ports.
+.It Va WITH_GHOSTSCRIPT_VER
+If set, the version of ghostscript to be used by ports.
+.It Va OVERRIDE_LINUX_BASE_PORT
+The default linux base to use.
+.It Va WITH_CCACHE_BUILD
+.Pq Vt bool
+If set, enables the use of
+.Xr ccache 1
+for building ports.
+.It Va CCACHE_DIR
+Which directory to use for the ccache data.
+.El
 .Sh FILES
 .Bl -tag -width ".Pa /usr/ports/Mk/bsd.port.mk" -compact
 .It Pa /usr/ports
@@ -495,6 +533,7 @@ The big Kahuna.
 .El
 .Sh SEE ALSO
 .Xr make 1 ,
+.Xr make.conf 5 ,
 .Xr pkg 8 ,
 .Xr portsnap 8
 .Pp