input: [Field] PatchFile [Value] 
output: The same syntax as the Patch field. The full path to this file is available using the %{PatchFile} percent expansion--do not use %a to access this file. Unlike Patch, PatchFile is applied as part of PatchScript. Fink checks that the listed file exists, is readable, and that its checksum matches the PatchFile-MD5 field. You may not use both Patch and PatchFile in the same package description. Any package that uses PatchFile must declare at least BuildDepends: fink (>= 0.24.12). Giving a higher version requirement is allowed if it is necessary for other reasons.