SOME DEPENDENCIES WERE MISSING. MASON missing dependencies

Hello,

has installed RT when running ‘make fixdeps’ is I always ended the
following message:

SOME DEPENDENCIES WERE MISSING.
MASON missing dependencies:
XML:: RSS> = 1.05 … MISSING
make: *** [testdeps] Error 1

I do not know how to install this dependency, because I went on the CPAN
website but I found nothing.

Have you any idea?

Thank you