[root@clergymail ~]# perl -MCPAN -e shellCPAN: File::HomeDir loaded ok (v0.66)
Constant subroutine __USE_POSIX undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 8.
Constant subroutine __USE_POSIX2 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 9.
Constant subroutine __USE_POSIX199309 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 10.
Constant subroutine __USE_POSIX199506 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 11.
Constant subroutine __USE_XOPEN undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 12.
Constant subroutine __USE_XOPEN_EXTENDED undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 13.
Constant subroutine __USE_UNIX98 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 14.
Constant subroutine __USE_LARGEFILE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 16.
Constant subroutine __USE_LARGEFILE64 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 17.
Constant subroutine __USE_FILE_OFFSET64 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 18.
Constant subroutine __USE_BSD undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 19.
Constant subroutine __USE_SVID undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 20.
Constant subroutine __USE_MISC undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 21.
Constant subroutine __USE_GNU undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 23.
Constant subroutine __USE_REENTRANT undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 24.
Constant subroutine _POSIX_SOURCE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 49.
Constant subroutine _POSIX_C_SOURCE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 51.
Constant subroutine _XOPEN_SOURCE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 53.
Constant subroutine _XOPEN_SOURCE_EXTENDED undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 55.
Constant subroutine _LARGEFILE64_SOURCE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 57.
Constant subroutine _LARGEFILE_SOURCE undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 104.
Constant subroutine __USE_ISOC99 undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 108.
Constant subroutine __GNU_LIBRARY__ undefined at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/features.ph line 156.

cpan shell -- CPAN exploration and modules installation (v1.9204)
ReadLine support enabled

Can't ioctl TIOCGETP: Invalid argument
Consider installing Term::ReadKey from CPAN site nearby
        at http://www.perl.com/CPAN
Or use
        perl -MCPAN -e shell
to reach CPAN. Falling back to 'stty'.
        If you do not want to see this warning, set PERL_READLINE_NOWARN
in your environment.