Index: bsd.port.mk
===================================================================
RCS file: /home/pcvs/ports/Mk/bsd.port.mk,v
retrieving revision 1.544
diff -u -r1.544 bsd.port.mk
--- bsd.port.mk	30 Sep 2006 19:25:45 -0000	1.544
+++ bsd.port.mk	28 Nov 2006 16:41:48 -0000
@@ -857,6 +857,15 @@
 # MTREE_FILE	- The name of the mtree file.
 #				  Default: /etc/mtree/BSD.x11.dist if USE_X_PREFIX is set,
 #				  /etc/mtree/BSD.local.dist otherwise.
+# CONF_FILES	- This directive should be used to define config files
+#				  installed by a port. The associated default config file should
+#				  also exist and be installed. (DEF_CONF_SUFFIX) Files here are 
+#				  relative to PREFIX. This is the equivalent of:
+#				  @unexec if cmp  -s %D/etc/foo.conf.sample %D/etc/foo.conf; then 
+#				  rm -f %D/etc/foo.conf; fi
+# DEF_CONF_SUFFIX
+#				- Filename suffix for the default CONF_FILES.
+#				  Default: .sample
 # PLIST_DIRS	- Directories to be added to packing list
 # PLIST_FILES	- Files and symbolic links to be added to packing list
 #
@@ -5419,6 +5428,16 @@
 	done
 	@${ECHO_CMD} '@cwd ${PREFIX}' >> ${TMPPLIST}
 .endif
+
+.if !defined(DEF_CONF_SUFFIX)
+	DEF_CONF_SUFFIX=       .sample
+.endif
+.if defined(CONF_FILES)
+	@for i in ${CONF_FILES}; do \
+		${ECHO_CMD} "@unexec if cmp -s %D/$${i}${DEF_CONF_SUFFIX} %D/$${i}; then rm -f %D/$${i}; fi" >> ${TMPPLIST}; \
+		${ECHO_CMD} "@unexec rm -f %D/$${i}${DEF_CONF_SUFFIX}" >> ${TMPPLIST}; \
+	done
+.endif
 	@for i in $$(${ECHO_CMD} ${__MANPAGES} ${_TMLINKS:M${_PREFIX}*:S|^${_PREFIX}/||} ' ' | ${SED} -E -e 's|man([1-9ln])/([^/ ]+) |cat\1/\2 |g'); do \
 		${ECHO_CMD} "@unexec rm -f %D/$${i%.gz} %D/$${i%.gz}.gz" >> ${TMPPLIST}; \
 	done