The Agony of GMP

I am trying to install Net::SFTP and it has been a major trial of  
patience. I finally get it working on one of my servers and now am  
trying to get it on another. Unfortunately I have run into a brick  
wall on the 2nd server (both are running 10.4.10) with no clue why  
they are different. The crux of the problem is that I cannot install  
Math::BigInt::GMP on this server. It appears there is a problem with  
the installer but yet this did not happen on the other server.

They key on the other server was to install GMP using macports 'port'  
command. I did the same on this server and all seemed to go well  
until I tried to install BigInt. I am getting the following:

Running make for C/CH/CHIPT/Math-GMP-2.04.tar.gz
   Has already been unwrapped into directory /Users/admin/.cpan/build/ 
Math-GMP-2.04-nSlAjY
   Has already been made
Running make test
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e"  
"test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/gmppm......Can't load '/Users/admin/.cpan/build/Math-GMP-2.04- 
nSlAjY/blib/arch/auto/Math/GMP/GMP.bundle' for module Math::GMP:  
dlopen(/Users/admin/.cpan/build/Math-GMP-2.04-nSlAjY/blib/arch/auto/ 
Math/GMP/GMP.bundle, 2): Symbol not found: ___gmpz_mul_2exp
   Referenced from: /Users/admin/.cpan/build/Math-GMP-2.04-nSlAjY/ 
blib/arch/auto/Math/GMP/GMP.bundle
   Expected in: dynamic lookup
at t/gmppm.t line 7
Compilation failed in require at t/gmppm.t line 7.
BEGIN failed--compilation aborted at t/gmppm.t line 7.
t/gmppm...... Dubious, test returned 255 (wstat 65280, 0xff00)
No subtests run

Can someone help me out with this? TIA.