--- Makefile.orig	2003-06-30 14:45:27.000000000 +0200
+++ Makefile	2014-02-16 12:01:21.454847187 +0100
@@ -1,13 +1,12 @@
 # Makefile - makefile for rexima
 
-CC=gcc
-CFLAGS=-O -Wall
+CC?=cc
+CFLAGS?=-O -pipe
 
 # Set BINDIR to directory for binary,
 # MANDIR to directory for man page.
 # Usually it will be simpler to just set PREFIX.
 #
-PREFIX=/usr/local
 BINDIR=$(PREFIX)/bin
 MANDIR=$(PREFIX)/man/man1
 
@@ -20,11 +19,11 @@
 	$(CC) $(CFLAGS) -o rexima rexima.o -lncurses
 
 installdirs:
-	/bin/sh ./mkinstalldirs $(BINDIR) $(MANDIR)
+	/bin/sh ./mkinstalldirs $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)
 
 install: rexima installdirs
-	install -s -m 755 rexima $(BINDIR)
-	install -m 644 rexima.1 $(MANDIR)
+	install -s -m 755 rexima $(DESTDIR)$(BINDIR)
+	install -m 644 rexima.1 $(DESTDIR)$(MANDIR)
 
 uninstall:
 	$(RM) $(BINDIR)/rexima $(MANDIR)/rexima.1