abuild: check for FHS forbidden dirs

abuild.in

@@ -547,6 +547,13 @@ get_split_func() {
 postcheck() {
 	local dir="$1" name="$2" i=
 	msg "Running postcheck for $name"
+	# checking for FHS compat
+	for i in "$dir"/srv/* "$dir"/usr/local/* "$dir"/opt/*; do
+		if [ -e "$i" ]; then
+			error "Packages must not put anything under /srv, /usr/local or /opt"
+			return 1
+		fi
+	done
 	# look for *.la files
 	i=$(find "$dir" -name '*.la' | sed "s|^$dir|\t|")
 	if [ -n "$i" ] && ! options_has "libtool"; then