# do a rule for each file that says 'copy' to new direcory on change
sub do_copy_rule
	{
	local($to,$files,$p)=@_;
	local($ret,$_,$n,$pp);
	
	$files =~ s/\//$o/g if $o ne '/';
	foreach (split(/\s+/,$files))
		{
		$n=&bname($_);
		if ($n =~ /bss_file/)
			{ $pp=".c"; }
		else	{ $pp=$p; }
		$ret.="$to${o}$n$pp: \$(SRC_D)$o$_$pp\n\t\$(CP) \$(SRC_D)$o$_$pp $to${o}$n$pp\n\n";
		}
	return($ret);
	}