--- aclang.m4~	Wed Oct 17 11:51:59 2001
+++ aclang.m4	Thu Nov  8 14:54:06 2001
@@ -402,6 +402,9 @@
 /* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
 char $1 ();
+#ifdef __cplusplus
+extern "C"
+#endif
 char (*f) ();
 ],
 [/* The GNU C library defines this for functions which it implements