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--- Makefile.orig	2007-12-12 17:44:32.000000000 +0100
+++ Makefile	2008-04-25 12:12:02.000000000 +0200
@@ -20,10 +20,10 @@
   $(error Please define PREFIX)
 endif
 
-bindir          := ${PREFIX}/bin
-docdir		:= ${PREFIX}/share/doc/menhir
-libdir	        := ${PREFIX}/share/menhir
-mandir          := ${PREFIX}/share/man/man1
+bindir          ?= ${PREFIX}/bin
+docdir		?= ${PREFIX}/share/doc/menhir
+libdir	        ?= ${PREFIX}/share/menhir
+mandir          ?= ${PREFIX}/share/man/man1
 MANS            := menhir.1
 DOCS            := manual.pdf demos
 LIBS            := standard.mly
@@ -52,13 +52,15 @@
 install:
 	mkdir -p $(bindir)
 	mkdir -p $(libdir)
-	mkdir -p $(docdir)
 	mkdir -p $(mandir)
 	install menhir $(bindir)
 	install -m 644 $(LIBS) $(libdir)
-	cp -r $(DOCS) $(docdir)
 	cp -r $(MANS) $(mandir)
 
+docinstall:
+	mkdir -p $(docdir)
+	cp -r $(DOCS) $(docdir)
+
 uninstall:
 	rm -rf $(bindir)/menhir
 	rm -rf $(libdir)