Re: tail claims "tail +n" is deprecated

[Alfred M. Szmidt]

   Breaking backward compatibility is so bad -- I've been bitten many
   times by autoconf-generated scripts that many GNU packages use and
   insist on remaking locally (why?) and that could not work because
   my local autoconf was newer than the version used by the package
   author.

autoconf/automake gets rerun automatically if the timestamps for
configure/Makefile.in is newer than for configure.ac/Makefile.am and
other such files.  It often occurs if you are getting something from
CVS.