By default, pnmtotiff tries to use LZW compression, but recent versions of
the TIFF library don't support it.
I fixed libgr-2.0.13-pnmtotiff.patch to use packbits compression by
default. I've attached the new version of this file to this bug.
Created attachment 77 [details]
new version of pnmtotiff patch to use packbits by default
Thanks for the update. Patch applied.