Makefile.PL fails if Module::Install is not installed in main chain:
.cpan/build/Math-BigInt-1.9902-peelm0 > perl Makefile.PL
Can't locate inc/Module/Install.pm in @INC (@INC contains: /opt/perl32/
lib/site_perl/5.12.2/PA-RISC2.0 /opt/perl32/lib/site_perl/5.12.2 /opt/
perl32/lib/5.12.2/PA-RISC2.0 /opt/perl32/lib/5.12.2 .) at Makefile.PL
line 7.
BEGIN failed--compilation aborted at Makefile.PL line 7.