Make install isn't executed on case insensitive filesystems!
--- Makefile.orig	2011-06-24 09:25:27.000000000 -0500
+++ Makefile	2011-10-02 17:53:00.000000000 -0500
@@ -93,6 +93,7 @@
 	if [ -f tree.o ]; then rm *.o; fi
 	rm -f *~
 
+.PHONY: install
 install: tree
 	install -d $(BINDIR)
 	install -d $(MANDIR)
