diff --git a/Makefile b/Makefile
index 83978da..5b59f9a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,5 @@
+CFLAGS = -Wall -g -O0 -DHAVE_ZLIB
+LFLAGS = -lz
+
 telnet-proxy: telnet-proxy.c libtelnet.c libtelnet.h
-	$(CC) -o telnet-proxy -Wall telnet-proxy.c libtelnet.c
+	$(CC) -o telnet-proxy $(CFLAGS) telnet-proxy.c libtelnet.c $(LFLAGS)