diff --git a/cf/win32.m4 b/cf/win32.m4
new file mode 100644
index 000000000..514513b81
--- /dev/null
+++ b/cf/win32.m4
@@ -0,0 +1,12 @@
+dnl $Id$
+dnl rk_WIN32_EXPORT buildsymbol symbol-that-export
+AC_DEFUN([rk_WIN32_EXPORT],[AH_TOP([#ifdef $1
+#ifndef $2
+#ifdef _WIN32_
+#define $2 _export _stdcall
+#else
+#define $2
+#endif
+#endif
+#endif
+])])