If you upgraded to Lion with Xcode 4.1, you may find youself fail to build any perls with perlbrew. This is because that the newly released /usr/bin/nm does not work with the perl building system. Luckly, this issues has already been solved in perl-blead, and BINGOS quickly made a new release of Devel::PatchPerl for us. To fix this isusse before the next perlbrew release, grab this patchperl stand