--- a/Makefile.am Wed Jun 18 00:51:08 2014 +0530 +++ b/Makefile.am Fri Jun 27 01:07:11 2014 +0530 @@ -118,7 +118,7 @@ (hg --cwd $(srcdir) id -i --debug) 2>/dev/null >$@.new \ || rm -f $@.new $(AM_V_at)if test -f $@.new; then \ - if ! diff $@ $@.new > /dev/null; then \ + if ! test -f "$@" || ! diff "$@" "$@".new > /dev/null ; then \ mv $@.new $@; \ else \ rm $@.new; \