or download this
# cpan2dist --format CPANPLUS::Dist::RPM --skiptest Net::Ping
[MSG] No '/root/.cpanplus/custom-sources' dir, skipping custom sources
...
Dist creation of 'Net::Ping' failed: 'Can't locate object method "spec
+path" via package "CPANPLUS::Dist::RPM"
at /usr/lib/perl5/site_perl/5.8.8/CPANPLUS/Dist/RPM.pm line 338.
' at /usr/bin/cpan2dist line 372.