input: [Field] PatchFileN [Value] 
output: If a package has several patch files, name them with these additional fields, starting with N = 2. So, the first patch file goes into PatchFile, the second patch file in PatchFile2 and so on. Any package that uses PatchFileN must declare at least BuildDepends: fink (>= 0.30.0). Giving a higher version requirement is allowed if it is necessary for other reasons.