If you are working out of the repo, you must be capable of running
autoreconf -vfi. Please install your Operating System’s
autoconf-archive
package and pkg-config. If you refuse or are running Windows, you
may directly obtain m4-ax_cxx_compile_stdcxx_11.m4 from the
autoconf-archive and place it in m4/. You may also acquire pkg.m4
from a dist tarball of pkg-config and place that in m4/.
The primary development platform is mingw32. We use the installer for mingw-get to achieve this.