configure.ac is broken with automake-1.16
With automake-1.16
autoreconf is broken:
***** aclocal *****
***** PWD: /var/tmp/portage/sys-fs/cryptsetup-2.0.1/work/cryptsetup-2.0.1
***** aclocal -I m4
/usr/bin/m4:configure.ac:506: bad expression in eval (bad input): ($+1) != (2)
/usr/bin/m4:configure.ac:506: bad expression in eval (bad input): (0r36:PYTHON_+1) != (0*4)
autom4te-2.69: /usr/bin/m4 failed with exit status: 1
aclocal-1.16: error: echo failed with exit status: 1
See downstream bug report: https://bugs.gentoo.org/648846