--- Makefile.orig	1998-12-03 23:33:58.000000000 +0800
+++ Makefile	2014-06-24 15:23:31.901094203 +0800
@@ -2,22 +2,24 @@
 #	Makefile,v 1.8 1998/12/03 15:33:58 rneswold Exp
 #
 
-PREFIX=/usr/local
 MANDIR=${PREFIX}/man
 BINDIR=${PREFIX}/bin
 
-LIBDIR = -L/usr/X11R6/lib -L/usr/local/lib
+LIBDIR = -L${LOCALBASE}/lib
 LIBS = -lXpm -lXext -lX11 -lkvm
 OBJS =	main.o if.o wmgeneral.o
-INCDIR = -I${X11BASE}/include
+INCDIR = -I${LOCALBASE}/include
+
+CC ?= cc
+CFLAGS ?= -O
 
 .c.o :
-	cc -c -g -O1 -Wall ${INCDIR} $< -o $*.o
+	$(CC) -c $(CFLAGS) -g -Wall ${INCDIR} $< -o $*.o
 
 all :: wmnet
 
 wmnet : $(OBJS)
-	cc -o wmnet $(OBJS) $(LIBDIR) $(LIBS) ${INCDIR}
+	$(CC) -o wmnet $(OBJS) $(LIBDIR) $(LIBS) ${INCDIR}
 
 main.o : wmnet-mask.xbm wmnet-master.xpm wmnet.h wmgeneral.h
 
@@ -29,9 +31,9 @@ clean :
 	rm -f $(OBJS) wmnet
 
 install.man : wmnet.1
-	install -c -m 644 -o man -g man wmnet.1 ${MANDIR}/man1
+	install -c -m 644 wmnet.1 $(DESTDIR)${MANDIR}/man1
 
 install.bin : wmnet
-	install -s -c -m 2555 -o bin -g kmem wmnet ${BINDIR}
+	install -s -c wmnet $(DESTDIR)${BINDIR}
 
 install : install.bin install.man