if (-f ".topdeps") {
	# This is a TopGit branch.  Fetch all the topic branches so
	# that builders can run "tg patch" and similar.
	(my $res, $stdout, $stderr) = captureStdoutStderr(600,
	  ("tg", "remote", "--populate", "origin"));
	print STDERR "Warning: `tg remote --populate origin' failed:\n$stderr" unless $res;
    }