Ken MacLeod has implemented XML-RPC for Perl. You can find his Frontier::RPC module at his website or through CPAN.
To install Frontier::RPC, download the package and compile it in the standard fashion:
bash$ gunzip -c Frontier-RPC-0.07b1.tar.gz | tar xvf - bash$ cd Frontier-RPC-0.07b1 bash$ perl Makefile.PL bash$ make bash$ make test bash$ su -c 'make install'
(The process will be slightly different on Windows systems, or if you don't have root access. Consult your Perl documentation for details.)