diff -u -r ../sl-5.01/Makefile ./Makefile
--- ../sl-5.01/Makefile	2014-04-16 07:12:46.000000000 +0200
+++ ./Makefile	2014-07-01 07:29:30.000000000 +0200
@@ -6,8 +6,5 @@
 #	Last Modified: 2014/03/31
 #==========================================
 
-CC=gcc
-CFLAGS=-O
-
 sl: sl.c sl.h
-	$(CC) $(CFLAGS) -o sl sl.c -lncurses
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o sl sl.c -lncurses