Enable procmail support larger then 2GB mailbox 

First of all…. if you thinking about this action, please consider maildir. Larger then 2GB a mailbox isn’t a good idea to the system performance.

1. Get the procmail source.
2. Edit the Makefile, append ‘-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE’ into CFLAGSO =
3. make; make install-suid

Good luck.