$NetBSD: patch-ap,v 1.2 2004/09/20 02:08:58 dmcmahill Exp $

--- src/zbuf/Makefile.default.orig	Tue Nov 12 19:18:57 1996
+++ src/zbuf/Makefile.default
@@ -36,14 +36,14 @@ $(IO)/input.c \
 $(IO)/zbufInOut.c $(IO)/zbuf2fastcap.c $(IO)/zbufProj.c $(IO)/zbufSort.c \
 $(IO)/dump_struct.c $(IO)/savemat_mod.c
 
-LIBS = -lm
+LIBS?= -lm
 
 # These compile flags are needed to account for differences in the
 #  resource usage system call used to get CPU time and memory use data
 #  - also used to select the correct CC macro definition for AIX machines
 #
 # for generic machine use (timers not supported)
-CFLAGS = -O -DOTHER
+CFLAGS += -DOTHER
 # for most machines running 4.2/3 use (only necessary if timers are needed)
 #CFLAGS = -O -DFOUR
 # for most machines running System V use (only necessary if timers are needed)