If you are experiencing some problems on updating dev-util/intltool on Gentoo, this is the message that is shown:

checking for perl… /usr/bin/perl
checking for perl >= 5.8.1… 5.10.1
checking for XML::Parser… configure: error: XML::Parser perl module is required for intltool

In other emerges if its failing on some perl module check during ./configure, its maybe because dev-lang/perl was updated an its modules weren’t compiled against the new one, on my case I just runned the command:

perl-cleaner --all

It will rebuild all your modules against your new perl, then you can re-emerge dev-util/intltool.