Warning: prerequisite XML::Parser failed to load: Can't locate XML/Parser.pm in @INC (@INC contains: /usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1 /usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1 /usr/lib/perl5/site_perl .) at (eval 4) line 3.
   ...
#/usr/bin/perl speedup Twig.pm.slow > Twig.pm
Can't locate XML/Parser.pm in @INC (@INC contains: /usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1 /usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1 /usr/lib/perl5/site_perl .) at speedup line 5.
BEGIN failed--compilation aborted at speedup line 5.
make: *** [Twig.pm] Error 2