Index: Mk/Scripts/check-stagedir.sh
===================================================================
--- Mk/Scripts/check-stagedir.sh
+++ Mk/Scripts/check-stagedir.sh
@@ -15,6 +15,8 @@
 
 . ${SCRIPTSDIR}/functions.sh
 
+: ${_NO_PLIST_PROMPT:=""}
+
 # lists an mtree file's contents, prefixed to dir.
 listmtree() { # mtreefile prefix
 	{
@@ -251,7 +253,7 @@
 	# generate plist - pretend the plist had been empty
 	: >${WRKDIR}/.plist-dirs-unsorted
 	: >${WRKDIR}/.plist-files
-	echo '/you/have/to/check/what/makeplist/gives/you'
+	[ -n ${_NO_PLIST_PROMPT} ] || echo '/you/have/to/check/what/makeplist/gives/you'
 fi
 
 parse_mtree
Index: Mk/Uses/autoplist.mk
===================================================================
--- /dev/null
+++ Mk/Uses/autoplist.mk
@@ -0,0 +1,18 @@
+# $FreeBSD$
+#
+# Generate plist automatically
+#
+# Feature:	autoplist
+# Usage:	USES=autoplist
+#
+# MAINTAINER: portmgr@FreeBSD.org
+
+.if !defined(_INCLUDE_USES_AUTOPLIST_MK)
+_INCLUDE_USES_AUTOPLIST_MK=	yes
+
+_USES_install+=	951:autoplist-generate
+autoplist-generate:
+	@${ECHO} "===>  Auto-generating plist for ${PKGNAME}"
+	@${SETENV} _NO_PLIST_PROMPT=yes ${CO_ENV} PLIST_SUB_SED="" ${SH} ${SCRIPTSDIR}/check-stagedir.sh makeplist > ${TMPPLIST}
+
+.endif