We began developing an API for PanLex in 2008. A prototype API server and clients are implemented in Perl 5. Perl 5.8.8, the version included with Red Hat Enterprise Linux 5, was found in 2010 to be classifying some characters incorrectly. In December 2010 we installed Perl 5.12.2 into /opt/perl (without threads support). In order to support the API server and clients, we also needed to install the URI, HTML::Tagset, HTML::Parser, libnet (from the “cpan” directory in the Perl distribution), and libwww packages.