[Haskell-cafe] running into an unresolved linker error on RHEL 5

Hello, I am building the unix-2.2.0.0. The linker is failing with -lgmp. I set "export LD_LIBRARY_ATH=/bin:/usr/lib". I did a "ls -l /usr/lib/*gmp*" and I can see: libgmp.so.3 libgmp.so.3.3.3 libgmpxx.so.3 libgmpxx.so.3.0.5, i.e. either gmp shared objects and whatever the gmp "xx" shared objects are. So why is my link of unix-2.2.0.0 failing in DynamicLinker? Kind regards, Vasili