Index: Mk/Uses/autoreconf.mk
===================================================================
--- Mk/Uses/autoreconf.mk
+++ Mk/Uses/autoreconf.mk
@@ -65,6 +65,10 @@
 # Valid args:	build	Don't run autoreconf, only add build dependencies
 #		2.69	Use this legacy version
 #
+# Port maintainers can set the following variable:
+#
+# AUTORECONF_FLAGS	The string to pass to autoreconf. Default: -f -i
+#
 # MAINTAINER:	ports@FreeBSD.org
 
 .if !defined(_INCLUDE_USES_AUTORECONF_MK)
@@ -73,6 +77,7 @@
 
 AUTORECONF?=	${LOCALBASE}/bin/autoreconf${_AUTORECONF}
 AUTORECONF_WRKSRC?=	${WRKSRC}
+AUTORECONF_FLAGS?=	-f -i
 
 .endif
 
@@ -122,7 +127,7 @@
 		${ECHO_MSG} '===>  Mk/Uses/autoreconf.mk: Error running intltoolize'; \
 		${FALSE}; fi; fi)
 .    endif
-	@(cd ${AUTORECONF_WRKSRC} && if ! ${AUTORECONF} -f -i; then \
+	@(cd ${AUTORECONF_WRKSRC} && if ! ${AUTORECONF} ${AUTORECONF_FLAGS}; then \
 		${ECHO_MSG} '===>  Mk/Uses/autoreconf.mk: Error running ${AUTORECONF}'; \
 		${FALSE}; fi)
 .  endif