--- Makefile.orig	2014-08-10 18:53:10.000000000 +0200
+++ Makefile	2014-08-10 18:53:25.000000000 +0200
@@ -1,16 +1,17 @@
 OBJ=webcrawl.o http.o path.o getxref.o url.o rewrite.o rename.o
-INSTDIR=/usr/local/bin
-MAN=/usr/local/man
+PREFIX ?= /usr/local
+INSTDIR = $(DESTDIR)$(PREFIX)/bin
+MAN = $(DESTDIR)$(PREFIX)/share/man
 
 webcrawl: $(OBJ)
-	gcc -o webcrawl $(OBJ)
+	$(CC) -o webcrawl $(LDFLAGS) $(OBJ)
 clean:
 	rm -f *.o *~ webcrawl
 install: webcrawl
 	install webcrawl $(INSTDIR)
	install webcrawl.1 $(MAN)/man1
 .c.o:
-	gcc -Wall -c $*.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -Wall -c $*.c
 
 webcrawl.o: webcrawl.c web.h
 http.o: http.c web.h