cpan> install IO::Pty::HalfDuplex::SysctlPoll
IO::Pty::HalfDuplex::SysctlPoll is up to date (undef).

cpan> install IO::Pty::HalfDuplex::PTrace
IO::Pty::HalfDuplex::PTrace is up to date (undef).
[download]

nathan@warthog:~$ perl -e '
use IO::Pty::HalfDuplex;

    my $pty = IO::Pty::HalfDuplex->new(backend => "SysctlPoll");
$pty->spawn("nethack") or warn "Spawn failed: $@$!";
print $pty->read;
'
XS code for IO::Pty::HalfDuplex::SysctlPoll not built. at /usr/local/s
+hare/perl/5.10.1/IO/Pty/HalfDuplex/SysctlPoll.pm line 44.
BEGIN failed--compilation aborted at /usr/local/share/perl/5.10.1/IO/P
+ty/HalfDuplex/SysctlPoll.pm line 46.
Compilation failed in require at (eval 2) line 3.
nathan@warthog:~$ perl -e '
use IO::Pty::HalfDuplex;

    my $pty = IO::Pty::HalfDuplex->new(backend => "PTrace");
$pty->spawn("nethack") or warn "Spawn failed: $@$!";
print $pty->read;
'
XS code for IO::Pty::HalfDuplex::PTrace not built. at /usr/local/share
+/perl/5.10.1/IO/Pty/HalfDuplex/PTrace.pm line 45.
BEGIN failed--compilation aborted at /usr/local/share/perl/5.10.1/IO/P
+ty/HalfDuplex/PTrace.pm line 47.
Compilation failed in require at (eval 2) line 3.
nathan@warthog:~$
[download]

So, how do I get the XS code built for these modules?