Ah, this is because of 
https://github.com/mono/mono/commit/4a995045915dbe45918787d158485dda26660e05, 
looks like the new m4 file has AC_PREREQ(2.64).

I'll talk to the engineer who wrote it.

On 2 Feb 2018, at 20:18, Neale Ferguson 
<ne...@sinenomine.net<mailto:ne...@sinenomine.net>> wrote:

./autogen.sh --with-libgc-threads=pthreads --enable-parallel-mark 
--with-tls=__thread --with-sgen-default-concurrent=yes --with-orbis=yes 
--with-cooperative=yes --with-wasm=yes --with-csc=mcs
Running libtoolize...
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
Running aclocal -I m4 -I .  ...
configure.ac:1006: error: Autoconf version 2.64 or higher is required
m4/ax_check_compile_flag.m4:60: AX_CHECK_COMPILE_FLAG is expanded from...
configure.ac:1006: the top level
autom4te: /usr/bin/m4 failed with exit status: 63
aclocal: autom4te failed with exit status: 63

From: Alexander Köplinger <alk...@microsoft.com<mailto:alk...@microsoft.com>>
Date: Friday, February 2, 2018 at 2:16 PM
To: Neale Ferguson <ne...@sinenomine.net<mailto:ne...@sinenomine.net>>
Cc: Mono-Devel 
<mono-devel-l...@lists.ximian.com<mailto:mono-devel-l...@lists.ximian.com>>
Subject: Re: [Mono-dev] Autoconf 2.64

Hmm, I'm not aware of any explicit bump in autoconf version, might be a mistake.
In fact, it looks like we even commented the #AC_PREREQ([2.62]) in configure.ac 
:D

Where do you get an error?

On 2 Feb 2018, at 19:33, Neale Ferguson 
<ne...@sinenomine.net<mailto:ne...@sinenomine.net>> wrote:

I noticed with a pull from master today that Autoconf 2.64 is now required. One 
of my builders (also used by Jenkins) is running SLES11SP3 which only has 2.63

Neale
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