--- makefile.orig	1994-03-07 21:10:46.000000000 +0800
+++ makefile	2014-06-08 11:28:02.677008487 +0800
@@ -1,6 +1,7 @@
-CC	= gcc 
-CFLAGS	= -Wall -O
-BINDIR	= /usr/local/bin/
+#CC	= gcc 
+CFLAGS+=	-I${PREFIX}/include
+LDFLAGS+=	-L${PREFIX}/lib -lX11
+BINDIR=		${PREFIX}/bin/
 
 
 all	: xchadance 
@@ -9,11 +10,11 @@ clean	:
 	rm *.o *~ *.bak core.* a.out
 
 install	:
-	cp xchadance $(BINDIR)
+	install -c -s xchadance $(DESTDIR)$(BINDIR)
 
 
 xchadance	: xchadance.o chadata.o
-	$(CC) xchadance.o chadata.o -o xchadance -lX11
+	$(CC) xchadance.o chadata.o -o xchadance ${LDFLAGS}
 
 
 xchadance.o	: xchadance.c xchadance.h