diff -ur wcslib-4.13.4/C/GNUmakefile wcslib-4.13.4.new/C/GNUmakefile
--- wcslib-4.13.4/C/GNUmakefile	2012-03-21 03:57:20.000000000 +0100
+++ wcslib-4.13.4.new/C/GNUmakefile	2012-06-27 15:30:31.795292229 +0200
@@ -266,7 +266,7 @@
 	     fi ; \
 	   fi
 	-  if [ ! -d "$(INCDIR)" ] ; then \
-	     $(INSTALL) -d -m 2775 $(INCDIR) ; \
+	     $(INSTALL) -d -m 0775 $(INCDIR) ; \
 	   fi
 	   $(INSTALL) -m 444 *.h $(INCDIR)
 	   $(RM) $(INCLINK)