diff --git a/scripts/pkgconfig.req.in b/scripts/pkgconfig.req.in
index ea44ae3..c764f4d 100755
--- a/scripts/pkgconfig.req.in
+++ b/scripts/pkgconfig.req.in
@@ -42,7 +42,8 @@ PkgconfigReqProv()
 		case "$1" in
 			*[!A-Za-z0-9_.+-]*)
 			   Fatal "$f: invalid pkg-config output: $line" ;;
-			[A-Za-z0-9_]*) ;;
+			[A-Za-z0-9]*) ;;
+			[_+]*[A-Za-z0-9]*) ;;
 			*) Fatal "$f: invalid pkg-config output: $line" ;;
 		esac
 		if [ $# = 1 ]; then
@@ -56,7 +57,8 @@ PkgconfigReqProv()
 		case "$3" in
 			*[!A-Za-z0-9_.+-]*)
 			   Fatal "$f: invalid pkg-config output: $line" ;;
-			[A-Za-z0-9_]*) ;;
+			[A-Za-z0-9]*) ;;
+			[_+]*[A-Za-z0-9]*) ;;
 			*) Fatal "$f: invalid pkg-config output: $line" ;;
 		esac
 		echo "pkgconfig($1) $2 $3"