$NetBSD: patch-videolib_Makefile,v 1.3 2022/04/24 10:57:28 tnn Exp $

--- videolib/Makefile.orig	2001-02-12 19:04:45.000000000 +0000
+++ videolib/Makefile
@@ -13,9 +13,9 @@ override INC               = 
 # CFLAGS
 #
 ifneq ($(DEBUG),NO)
-  override CFLAGS          = -DDEBUG -g
+  override CFLAGS          += -DDEBUG -g
 else
-  override CFLAGS          = -DNDEBUG -O2
+  override CFLAGS          += -DNDEBUG -O2
 endif
 C_WARN_FLAG                = -Wall
 override CFLAGS           += $(C_WARN_FLAG) $(INC)