ln: `ip_unix.c': File exists
ip_unix.c is a file that is made as part of the build. It should not exist when the build is started.
Try doing a "make clean" and then try the build again.
If you got your copy from a third-party, try getting it directly from the UW distribution at:
ftp://ftp.cac.washington.edu/mail/imap.tar.Z
-- Mark --
http://staff.washington.edu/mrc Science does not emerge from voting, party politics, or public debate. Si vis pacem, para bellum.