--- a/configure	Tue Apr 25 21:46:46 2017 +0200
+++ b/configure	Tue Apr 25 21:48:24 2017 +0200
@@ -303,6 +303,9 @@
    --ldflags)
       LDFLAGS="$value"
       ;;
+   --add-ldflags)
+      LDFLAGS="$LDFLAGS $value"
+      ;;
    --c-compiler)
       CC="$value"
       ;;