PostGIS 2.0.0 does not build with clang
The transformation of sql.in files into sql by means of CPP -traditional-cpp fails if CPP = clang -E.
Besides, I've tried various overrides to change the CPP value to some gcc version, but to no avail. The build system seems particularly obscure when it comes to how CPP is inferred.
Can it be simplified? Or the preprocessing of sql.in files adapted for clang?