Turn SENDMAIL_CF_DIR into an officially supported make.conf variable

and use it in src/etc/sendmail/Makefile in case the user wants to use
a different path to the sendmail m4 sources (e.g., sendmail port users).

Submitted by:	dinoex
MFC after:	21 days
X-MFC after:	RELENG_4 code freeze ends

2 files changed, 12 insertions, 0 deletions

diff --git a/share/examples/etc/make.conf b/share/examples/etc/make.conf
index f4805edbfedc..dab751dd82b5 100644
--- a/share/examples/etc/make.conf
+++ b/share/examples/etc/make.conf
@@ -263,6 +263,11 @@
 #
 #SENDMAIL_ADDITIONAL_MC=/etc/mail/foo.mc /etc/mail/bar.mc
 #
+# The following overrides the default location for the m4 configuration
+# files used to build a .cf file from a .mc file.
+#
+#SENDMAIL_CF_DIR=/usr/local/share/sendmail/cf
+#
 # Setting the following variable modifies the flags passed to m4 when
 # building a .cf file from a .mc file.  It can be used to enable
 # features disabled by default.
diff --git a/share/man/man5/make.conf.5 b/share/man/man5/make.conf.5
index 18f3e47053d7..5a4f45fcaf6b 100644
--- a/share/man/man5/make.conf.5
+++ b/share/man/man5/make.conf.5
@@ -635,6 +635,13 @@ The value should include the full path to the
 file(s), e.g.,
 .Pa /etc/mail/foo.mc
 .Pa /etc/mail/bar.mc .
+.It Va SENDMAIL_CF_DIR
+.Pq Vt str
+Override the default location for the m4 configuration files used to build a
+.Pa .cf
+file from a
+.Pa .mc
+file.
 .It Va SENDMAIL_M4_FLAGS
 .Pq Vt str
 Flags passed to m4 when building a