[error] failed to resolve handler `Apache::AuthCAS->authenticate':
 Can't locate Apache/Const.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 . /etc/apache2) 

at /usr/local/share/perl/5.8.4/Apache/AuthCAS.pm line 19.\n
BEGIN failed--compilation aborted 
at /usr/local/share/perl/5.8.4/Apache/AuthCAS.pm line 26.\n
Compilation failed in require at (eval 4) line 3.\n