cpan>look Math::GSL
/root/.cpan/build/Math-GSL-0.22-ZItw13/> ls -l
.
.
.
/root/.cpan/build/Math-GSL-0.22-ZItw13/> rm Makefile

/root/.cpan/build/Math-GSL-0.22-ZItw13/> perl Makefile.PL