[sane-devel] Building backends from git

[Bruce Schultz]

Hi,

I'm hitting this error while running ./configure in a fresh clone of the 
backends git repo

...
checking for GNU gettext in libc... yes
checking whether to use NLS... yes
checking where the gettext function comes from... libc
checking for sane-config... /usr/bin/sane-config
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
./configure: line 19307: syntax error near unexpected token `noext,'
./configure: line 19307: `AX_CXX_COMPILE_STDCXX_11(noext, optional)'

I found a couple of suggestions on the intwebs to add the following line 
to the top level Makefile.am
ACLOCAL_AMFLAGS = -I m4

but I found that is already in there, so I'm at a loss what to do next. 
Any suggestions?

This is on gentoo with
gcc 8.3.0
autoconf 2.69
automake 1.16.1

Thanks
Bruce