+# Ensure that whenever we pull in a gnulib update or otherwise change to a
+# different version (i.e., when switching branches), we also rerun ./bootstrap.
+curr_status=.git-module-status
+t=$(git submodule status|sed 's/^[ +-]//;s/ .*//')
+if test "$t" = "$(cat $curr_status 2>/dev/null)"; then
+ : # good, it's up to date
+else
+ echo running bootstrap...
+ ./bootstrap && echo "$t" > $curr_status
+fi