--- a/config.rpath
+++ b/config.rpath
@@ -438,7 +438,14 @@
   bsdi4*)
     ;;
   cygwin* | mingw* | pw32*)
-    shrext=.dll
+    case "$TOOLCHAIN_TARGET" in
+      i686-w64-mingw32 | x86_64-w64-mingw32)
+	shrext=.dll.a
+	;;
+      *)
+	shrext=.dll
+	;;
+    esac
     ;;
   darwin* | rhapsody*)
     shrext=.dylib