unit-path as a compiler directive?

Why can't unit-path be a compiler directive? And {$uses} for that matter? I include a prefix file, and I'd rather store the paths in the prefix file so the command line isn't several lines long and I can more easily see what file it is actually compiling. I can't use a separate "uses xxx;" clause since the prefix file comes before the unit yyy; line in the file. Is there a good reason they are not allowed? Thanks, Peter. -- <http://www.interarchy.com/> <http://documentation.interarchy.com/>