4 files changed, 54 insertions, 14 deletions
diff --git a/Mk/Scripts/depends-list.sh b/Mk/Scripts/depends-list.sh
index ce4f4b75a094..843bedd03958 100644
--- a/Mk/Scripts/depends-list.sh
+++ b/Mk/Scripts/depends-list.sh
@@ -37,7 +37,7 @@ while getopts "fmrw" FLAG; do
 done
 shift $((OPTIND-1))
 
-validate_env PORTSDIR dp_PKGNAME
+validate_env PORTSDIR dp_OVERLAYS dp_PKGNAME
 if [ ${recursive} -eq 1 -o ${requires_wrkdir} -eq 1 ]; then
 	validate_env dp_MAKE
 	# Cache command executions to avoid looking them up again in every
@@ -65,16 +65,25 @@ check_dep() {
 
 		case "${2}" in
 		/*) d=${2} ;;
-		*) d=${PORTSDIR}/${2} ;;
+		*) for overlay in ${dp_OVERLAYS} ${PORTSDIR}; do
+			d=${overlay}/${2}
+			f=
+			case "${d}" in
+			*@*/*) ;; # Ignore @ in the path which would not be a flavor
+			*@*)
+				f=${d##*@}
+				d=${d%@*}
+				;;
+			esac
+			if [ -f ${d}/Makefile ]; then
+				if [ -n $f ]; then
+					export FLAVOR=$f
+				fi
+				break
+			fi
+		done
 		esac
 
-		case "${d}" in
-		*@*/*) ;; # Ignore @ in the path which would not be a flavor
-		*@*)
-			export FLAVOR=${d##*@}
-			d=${d%@*}
-			;;
-		esac
 		if [ ${flavors} -eq 1 -a -n "${FLAVOR:-}" ]; then
 			port_display="${d}@${FLAVOR}"
 		else
diff --git a/Mk/Scripts/do-depends.sh b/Mk/Scripts/do-depends.sh
index 163570052a54..af93ec646a74 100644
--- a/Mk/Scripts/do-depends.sh
+++ b/Mk/Scripts/do-depends.sh
@@ -11,7 +11,7 @@ validate_env dp_RAWDEPENDS dp_DEPTYPE dp_DEPENDS_TARGET dp_DEPENDS_PRECLEAN \
 	dp_DEPENDS_CLEAN dp_DEPENDS_ARGS dp_USE_PACKAGE_DEPENDS \
 	dp_USE_PACKAGE_DEPENDS_ONLY dp_PKG_ADD dp_PKG_INFO dp_WRKDIR \
 	dp_PKGNAME dp_STRICT_DEPENDS dp_LOCALBASE dp_LIB_DIRS dp_SH \
-	dp_SCRIPTSDIR PORTSDIR dp_MAKE dp_MAKEFLAGS
+	dp_SCRIPTSDIR PORTSDIR dp_MAKE dp_MAKEFLAGS dp_OVERLAYS
 
 [ -n "${DEBUG_MK_SCRIPTS}" -o -n "${DEBUG_MK_SCRIPTS_DO_DEPENDS}" ] && set -x
 
@@ -125,7 +125,15 @@ for _line in ${dp_RAWDEPENDS} ; do
 
 	case "${origin}" in
 	/*) ;;
-	*) origin="${PORTSDIR}/${origin}" ;;
+	*)
+		for overlay in ${dp_OVERLAYS} ${PORTSDIR}; do
+			orig="${overlay}/${origin}"
+			if [ -f "${orig}/Makefile" ]; then
+				break
+			fi
+		done
+		origin="${orig}"
+		;;
 	esac
 	case "${origin}" in
 	*@*/*) ;; # Ignore @ in the path which would not be a flavor
diff --git a/Mk/bsd.port.mk b/Mk/bsd.port.mk
index b6d630ead0b5..fb88ab5614d4 100644
--- a/Mk/bsd.port.mk
+++ b/Mk/bsd.port.mk
@@ -1029,6 +1029,7 @@ STAGEDIR?=	${WRKDIR}/stage
 NOTPHONY?=
 FLAVORS?=
 FLAVOR?=
+OVERLAYS?=
 # Disallow forced FLAVOR as make argument since we cannot change it to the
 # proper default.
 .if empty(FLAVOR) && !empty(.MAKEOVERRIDES:MFLAVOR)
@@ -1450,7 +1451,17 @@ ${_f}_ARGS:=	${f:C/^[^\:]*(\:|\$)//:S/,/ /g}
 .endif
 .endfor
 .for f in ${USES}
-.include "${USESDIR}/${f:C/\:.*//}.mk"
+.undef _usefound
+.for udir in ${OVERLAYS:C,$,/Mk/Uses,} ${USESDIR}
+_usefile=	${udir}/${f:C/\:.*//}.mk
+.if exists(${_usefile}) && !defined(_usefound)
+_usefound=
+.include "${_usefile}"
+.endif
+.endfor
+.if !defined(_usefound)
+ERROR+=	"Unkonwn USES=${f:C/\:.*//}"
+.endif
 .endfor
 
 .if !empty(FLAVORS)
@@ -1962,7 +1973,17 @@ ${_f}_ARGS:=	${f:C/^[^\:]*(\:|\$)//:S/,/ /g}
 .endif
 .endfor
 .for f in ${_USES_POST}
-.include "${USESDIR}/${f:C/\:.*//}.mk"
+.undef _usefound
+.for udir in ${OVERLAYS:C,$,/Mk/Uses,} ${USESDIR}
+_usefile=	${udir}/${f:C/\:.*//}.mk
+.if exists(${_usefile}) && !defined(_usefound)
+_usefound=
+.include "${_usefile}"
+.endif
+.endfor
+.if !defined(_usefound)
+ERROR+=	"Unkonwn USES=${f:C/\:.*//}"
+.endif
 .endfor
 
 .if defined(PORTNAME)
@@ -3964,6 +3985,7 @@ ${deptype:tl}-depends:
 		dp_SH="${SH}" \
 		dp_SCRIPTSDIR="${SCRIPTSDIR}" \
 		PORTSDIR="${PORTSDIR}" \
+		dp_OVERLAYS="${OVERLAYS}" \
 		dp_MAKE="${MAKE}" \
 		dp_MAKEFLAGS='${.MAKEFLAGS}' \
 		${SH} ${SCRIPTSDIR}/do-depends.sh
@@ -4018,6 +4040,7 @@ DEPENDS-LIST= \
 			dp_PKGNAME="${PKGNAME}" \
 			dp_PKG_INFO="${PKG_INFO}" \
 			dp_SCRIPTSDIR="${SCRIPTSDIR}" \
+			dp_OVERLAYS="${OVERLAYS}" \
 			${SH} ${SCRIPTSDIR}/depends-list.sh \
 			${DEPENDS_SHOW_FLAVOR:D-f}
 
diff --git a/Mk/bsd.sanity.mk b/Mk/bsd.sanity.mk
index 04542537d798..c3490ea1bab9 100644
--- a/Mk/bsd.sanity.mk
+++ b/Mk/bsd.sanity.mk
@@ -58,7 +58,7 @@ ERROR+=	"${a} is unsupported, please use ${${a}_ALT}"
 
 # Warnings only when DEVELOPER=yes
 
-.if exists(${.CURDIR}/../../Mk/bsd.port.mk)
+.if exists(${.CURDIR}/../../Mk/bsd.port.mk) || ${OVERLAYS:tA:M${.CURDIR:H:H}} == ${.CURDIR:H:H}
 .if ${.CURDIR:H:T} != ${PKGCATEGORY}
 DEV_ERROR+=	"The first entry in CATEGORIES should be the directory where the port lives"
 .endif