Compilation problem (related to comments)

I cannot compile this using neither gfortran nor ifort.  In both cases, the compiler was complaining that it didn't know how to deal with the C-style comments in the source files coming out of cpp.

What fixed it in my case was to remove the `-C`  from `CPPFLAGS` definition in `configure.oa` after running `./configure`.

Is this expected behavior, or is there something fishy with my system?