Installing Perl Module

Hi All,
When I tried to install Math::Pari module in a AIX 5.3 server,I am getting the following error.
# pwd
/usr/local/bin
# cd Math-Pari-2.010709
# perl Makefile.PL
Did not find GP/PARI build directory around.

Do you want to me to fetch GP/PARI automatically?

(If you do not, you will need to fetch it manually, and/or direct me to
the directory with GP/PARI source via the command-line option paridir=/dir)

Make sure you have a large scrollback buffer to see the messages, or `tee'
the STDOUT/STDERR to a file.

Fetch? (y/n, press Enter) y
Getting GP/PARI from ftp://megrez.math.u-bordeaux.fr/pub/pari/unix/
Cannot create FTP object: A system call received a parameter that is not valid. at utils/Math/PariBuild.pm line 238, <STDIN> line 1.

Can't fetch file with Net::FTP, now trying with LWP::UserAgent...
Can't fetch directory listing from ftp://megrez.math.u-bordeaux.fr/pub/pari/unix/: 500 (Internal Server Error) LWP::Protocol::MyFTP: Bad hostname 'megrez.math.u-bordeaux.fr'
Client-Date: Wed, 26 Mar 2008 12:57:30 GMT

# make
make: make 1254-025 There must be an existing description file or specify a target.
Anybody please help me to solve this issue.

Thanks in advance.

Read and interpret the error messages. It never fetched the file. (Viewing that URL in my browser works fine; can you visit it, too?)

Maybe a firewall or proxy issue?