Build-tools/Do-compile:
  Backport of a change Lenz did in 4.1 (without it, Solaris sends empty mails):
  
  Improved the abort subroutine to not rely on an external "tail" command (the
  default /usr/bin/tail on Solaris does not understand the "-n" notation).
  Get rid of a "useless use of cat" case in the process.