AC_PROG_LIBTOOL error should be fixed by GNU m4 1.4.2

[Paul Eggert]

Ludovic Courtès <address@hidden> writes:

> This seems to be a bug in GNU M4 1.4.1 (see [1, 2, 3] for details).

That bug should be fixed in GNU m4 1.4.2, available here:

ftp://ftp.gnu.org/gnu/m4/m4-1.4.2.tar.gz

(I write "should be" because I couldn't reproduce the problem on my
Solaris 8 box with m4 1.4.1.  However, the fixes do address all the
reported symptoms.)


> I had the same problem on Tru64 and switching back to version 1.4
> fixed the problem.

GNU m4 1.4 has some very subtle bugs that are much harder to debug:
they cause Autoconf to silently produce incorrect results, and I've
run into this problem several times in practice.  I really cannot
recommend 1.4.