--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -149,6 +149,15 @@
 #				  This variable supercedes CD_MOUNTPT, which is
 #				  obsolete.
 #
+# This variables control local modifications.
+#
+# LOCAL_PATCHDIR_PREFIX - Root of directory tree similar to ports
+#				directory tree with local patches (and possibly
+#				local ports).
+# WITHOUT_LOCAL_PATCHDIR - Should never be used in official ports tree.
+#				Set this variable in local ports to not clash
+#				local pathes themselves.
+# 
 # Set these if your port should not be built under certain circumstances.
 # These are string variables; you should set them to the reason why
 # they are necessary.
@@ -1366,6 +1375,7 @@
 FILESDIR?=		${MASTERDIR}/files
 SCRIPTDIR?=		${MASTERDIR}/scripts
 PKGDIR?=		${MASTERDIR}
+LOCAL_PATCHDIR?=	${LOCAL_PATCHDIR_PREFIX}/${PATCHDIR}
 
 .if defined(USE_IMAKE) && !defined(USE_X_PREFIX)
 USE_X_PREFIX=	yes
@@ -3572,6 +3582,35 @@
 			done; \
 		fi; \
 	fi
+.if defined(LOCAL_PATCHDIR_PREFIX) && !defined(WITHOUT_LOCAL_PATCHDIR)
+	@if [ -d ${LOCAL_PATCHDIR}/ ]; then \
+		if [ "`echo ${LOCAL_PATCHDIR}/patch-*`" != "${LOCAL_PATCHDIR}/patch-*" ]; then \
+			${ECHO_MSG} "===>  Applying LOCAL patches for ${PKGNAME}" ; \
+			PATCHES_APPLIED="" ; \
+			for i in ${LOCAL_PATCHDIR}/patch-*; do \
+				case $$i in \
+					*.orig|*.rej|*~|*,v) \
+						${ECHO_MSG} "===>   Ignoring patchfile $$i" ; \
+						;; \
+					*) \
+						if [ ${PATCH_DEBUG_TMP} = yes ]; then \
+							${ECHO_MSG} "===>   Applying LOCAL patch $$i" ; \
+						fi; \
+						if ${PATCH} ${PATCH_ARGS} < $$i ; then \
+							PATCHES_APPLIED="$$PATCHES_APPLIED $$i" ; \
+						else \
+							${ECHO_MSG} `${ECHO} ">> Patch $$i failed to apply cleanly." | ${SED} "s|${LOCAL_PATCHDIR}/||"` ; \
+							if [ x"$$PATCHES_APPLIED" != x"" ]; then \
+								${ECHO_MSG} `${ECHO} ">> Patch(es) $$PATCHES_APPLIED applied cleanly." | ${SED} "s|${LOCAL_PATCHDIR}/||g"` ; \
+							fi; \
+							${FALSE} ; \
+						fi; \
+						;; \
+				esac; \
+			done; \
+		fi; \
+	fi
+.endif
 .endif
 
 .if !target(run-autotools)