diff --git a/src/post_modules/_Image_WebP/acconfig.h b/src/post_modules/_Image_WebP/acconfig.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff3db9e77d5029add55890ee4d168c828332a30d
--- /dev/null
+++ b/src/post_modules/_Image_WebP/acconfig.h
@@ -0,0 +1,10 @@
+/*
+|| This file is part of Pike. For copyright information see COPYRIGHT.
+|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING
+|| for more information.
+|| $Id$
+*/
+
+#undef HAVE_LIBVPX
+@TOP@
+@BOTTOM@