Solution:
1 cd /usr/bin/
2 ll
3 rm perl
4 ln -s /usr/local/bin/perl perl
5 ll
6 /usr/local/cpanel/bin/cpanm -n Digest::SHA1 Crypt::PasswdMD5
Try to rebuild apache once again.
Should work!
!! Failed to install CPAN Perl module(s) Crypt::PasswdMD5 !!
