--- Makefile.orig	2002-08-17 16:01:57.000000000 +0200
+++ Makefile	2003-02-04 16:14:25.000000000 +0100
@@ -1,5 +1,5 @@
 CC    = gcc
-LIBS  = -lpng
+LIBS  = -lpng -lz -lm
 FLAGS = -g -O2 -W -Wall -DPNG_SETJMP_NOT_SUPPORTED
 
 INSTALL = /usr/bin/install