diff --git a/Makefile.netware b/Makefile.netware
index 300b91ba..6e39c84b 100644
--- a/Makefile.netware
+++ b/Makefile.netware
@@ -258,6 +258,9 @@ config.h: Makefile.netware
 	@echo $(DL)** Do not edit this file - it is created by make!$(DL) >> $@
 	@echo $(DL)** All your changes will be lost!!$(DL) >> $@
 	@echo $(DL)*/$(DL) >> $@
+	@echo $(DL)#ifndef NETWARE$(DL) >> $@
+	@echo $(DL)#error This $(notdir $@) is created for NetWare platform!$(DL) >> $@
+	@echo $(DL)#endif$(DL) >> $@
 	@echo $(DL)#define OS "i586-pc-NetWare"$(DL) >> $@
 	@echo $(DL)#define VERSION "$(LIBCARES_VERSION_STR)"$(DL) >> $@
 	@echo $(DL)#define PACKAGE_BUGREPORT "a suitable curl mailing list => http://curl.haxx.se/mail/"$(DL) >> $@
@@ -335,6 +338,11 @@ else
 	@echo $(DL)#define HAVE_SYS_SOCKIO_H 1$(DL) >> $@
 	@echo $(DL)#define HAVE_NETDB_H 1$(DL) >> $@
 endif
+	@echo $(DL)#ifdef __GNUC__$(DL) >> $@
+	@echo $(DL)#define HAVE_VARIADIC_MACROS_GCC 1$(DL) >> $@
+	@echo $(DL)#else$(DL) >> $@
+	@echo $(DL)#define HAVE_VARIADIC_MACROS_C99 1$(DL) >> $@
+	@echo $(DL)#endif$(DL) >> $@
 ifdef OLD_NOVELLSDK
 	@echo $(DL)#define socklen_t int$(DL) >> $@
 endif