input: [Field] PatchScript [Value] 
output: A list of commands that are run in the patch phase. This is the place to put commands that patch or otherwise modify the package source. See the note on scripts below. Before the commands are executed, percent expansion takes place. If a PatchFile field exists, the default PatchScript is: patch -p1 < %{PatchFile} If one or more PatchFileN fields are used, the following is appended as needed to the default script: patch -p1 < %{PatchFileN} If there is no PatchFile, the default is blank. If you have an explicit PatchScript, you must apply the PatchFile(s) explicitly.