t / t5100 / rfc2047-info-0004on commit diff.c: the builtin_diff() deals with only two-file comparison (b8d9c1a)
   1Author: Nathaniel Borenstein   (םולש ןב ילטפנ)
   2Email: nsb@thumper.bellcore.com
   3Subject: Test of new header generator
   4