Instead of downloading OSGeo source code from a third-party source, how about directly from the project, then make the alterations in-formula using 3 or 4 `inreplace` commands?

browse: http://trac.osgeo.org/proj/browser/branches/4.8/proj/src/projects.h
source: http://trac.osgeo.org/proj/export/2409/branches/4.8/proj/src/projects.h