erro ao instalar o spamassassim

Olá pessoal, estou instalando o spamassassim no slack, juntamente com o sendmail, e quando eu do o seguinte comando, aparece esse erro:

comando: root@mail:/pkg# spamd -c -d --nouser-config -u mail
erro:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_COLLATE = "C",
LANG = "pt_BR"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Can't locate Digest/SHA1.pm in @INC (@INC contains: ../lib /usr/lib/perl5/site_perl/5.8.7/i486-linux /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/5.8.7/i486-linux /usr/lib/perl5/5.8.7 /usr/lib/perl5/site_perl) at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/EvalTests.pm line 33.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/EvalTests.pm line 33.
Compilation failed in require at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/PerMsgStatus.pm line 55.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/PerMsgStatus.pm line 55.
Compilation failed in require at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin.pm line 71.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin.pm line 71.
Compilation failed in require at /usr/bin/spamd line 40.
BEGIN failed--compilation aborted at /usr/bin/spamd line 40.

O que pode ser?