I tried to compile Metapad with Pelles C 6.50 and it works wonderfully with some modifications, with one caveat: I had to remove the separator at the end of the favourites menu.
If you dont do this, the dialog editor not show the menu correcty and the compiled program runs with a corrupted menu bar.
It is a joy to use Pelles C. I hope that your compiler grows much more and gets more mature. Its sincerely!!!