--- a/configure	Tue Dec 15 01:10:15 2009 +0100
+++ b/configure	Tue Dec 15 01:10:57 2009 +0100
@@ -14,4 +14,9 @@
     esac
 done
 
-sed -e "s|@prefix@|$prefix|g" <Makefile.in >Makefile
+
+set -e
+umask 0333
+sed -e "s|@prefix@|$prefix|g" <Makefile.in >Makefile.$$
+rm -f Makefile
+mv Makefile.$$ Makefile