--- mysql323-server/Makefile.orig	Mon Sep  1 00:27:54 2003
+++ mysql323-server/Makefile	Mon Sep  1 00:28:11 2003
@@ -39,6 +39,10 @@
 		--program-prefix='' \
 		--with-innodb
 
+.ifdef USE_MYSQL
+.error You have `USE_MYSQL' variable defined either in environment or in make(1) arguments. Please undefine and try again.
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${MACHINE_ARCH} == "i386"