Andrew Apted - 2009-05-24

Windows has a case insensitive filesystem, so there the files "PAR.wad"
and "par.wad" have to be considered the same.

I guess technically for Linux the comparison should be case sensitive.

However, since in your example glBSP still works (it produced par.wad),
I consider this a minor and harmless bug and don't plan to fix it.