blas (or lapack) not found (or not linked)
The blas library, as well as the lapack, is a mandatory library for the EXC code. If the library is not in a standard directory, the ./configure will not find it. Use the option
--with-blas="/dir/where/the/blas/are/installed/"
However there's an important thing to know:
when linking libraries to fortran code is MUCH RECOMMENDED to compile all libraries with the same compiler (and version) you use to compile EXC.