diff --git a/libs/xmlrpc-c/xmlrpc_amconfig.h.in b/libs/xmlrpc-c/xmlrpc_amconfig.h.in
index 0ea13cec7d..cd289f2bc4 100644
--- a/libs/xmlrpc-c/xmlrpc_amconfig.h.in
+++ b/libs/xmlrpc-c/xmlrpc_amconfig.h.in
@@ -22,6 +22,9 @@
 #undef HAVE_STRCASECMP
 #undef HAVE_STRICMP
 #undef HAVE__STRICMP
+#undef HAVE_WCHAR_H
+#undef HAVE_SYS_FILIO_H
+#undef HAVE_SYS_IOCTL_H
 
 
 /* Define if you have the socket library (-lsocket).  */