[CentOS] rpmbuild annoyance

I'm building a package (rasmol, if you must know) from an srpm. It's an
FC20 pkg, nothing older, but the software itself hasn't changed. So... I
try the build, and it fails, telling me:
gcc: %__global_ldflags: No such file or directory
make: *** [rasmol] Error 1

Now, this isn't a brand-new package, so I'm puzzled by the error. Is there
supposed to be something I need to add to the rpmbuild command line,
or...?

Clues for the poor.

      mark