i successfully built .41 on Mac OS X Tiger X.4.8...
please help a noob understand how to apply the gocr-0.41-pgm.patch
tar -xzf gocr-0.41.tar.gz
# here we add the patch
patch -p0 <../gocr-0.41-pgm.patch
# here patch is added
I dont know if that works on MAC OS X, because I dont have a MAC. But if not look into the patch-file and do the changes by hand. There are only few changes and patch file is easy to understand.