spamassassin error?

when I Install spamassassin in my debian server form the
./spam.sh script I got the following error
cd /usr/local/directadmin/scripts
# ./spam.sh
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at Makefile.PL line 1.
BEGIN failed--compilation aborted at Makefile.PL line 1.
make: *** No se especificó ningún objetivo y no se encontró ningún makefile. Alto.
make: *** No hay ninguna regla para construir el objetivo `install'. Alto.
File already exists: Mail-SpamAssassin-3.1.0.tar.gz
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at Makefile.PL line 8.
BEGIN failed--compilation aborted at Makefile.PL line 8.
make: *** No targets specified and no makefile found. Stop.
make: *** No rule to make target `install'. Stop.
what may be the problem?
can I use apt-get install spamassassin instead of it