cpan[4]> install Math::GMP
Running install for module 'Math::GMP'
Running make for C/CH/CHIPT/Math-GMP-2.04.tar.gz
  Has already been unwrapped into directory /root/.cpan/build/Math-GMP-2.04-0B7dZP
Could not make: Unknown error
Warning (usually harmless): 'YAML' not installed, will not store persistent state
Running make test
  Can't test without successful make
Running make install
  Make had returned bad status, install seems impossible