configure produces zero length Makefile

[Lars Hecking]

> Time to update my autoconf.  I think it is in general better to report
> such stuff to the autoconf folks.  There is not much we can do in
> GnuPG about it.
 
 Well, you already have "upgraded" gnupg from the proven stable autoconf 2.13
 to the proven buggy autoconf 2.5x.

$ cd gnupg-1.0.7
$ ./configure
[...]
checking for sendmail... /usr/sbin/sendmail
[...]
$ ls -l /usr/sbin/sendmail
ls: /usr/sbin/sendmail: No such file or directory
$ 

 This serious bug (botched evaluation of $PATH in AC_PATH_PROG) was fixed in
 autoconf 2.53a (prerelease version).

 The gnupg bug is that you don't look for /usr/lib/sendmail :)