There is a python traceback during install making the package to be FTBFS on s390x.

...
Making install in pyaff
make[1]: Entering directory '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff'
cd . && /usr/bin/python setup.py \
	build --build-base /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/build \
	build_ext --include-dirs /builddir/build/BUILD/AFFLIBv3-3.7.15/include --library-dirs /builddir/build/BUILD/AFFLIBv3-3.7.15/lib/.libs
running build
running build_ext
make[2]: Entering directory '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff'
cd . && /usr/bin/python setup.py \
	build --build-base /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/build \
	egg_info --egg-base /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff \
	install --prefix /builddir/build/BUILDROOT/afflib-3.7.15-1.fc26.s390x/usr --single-version-externally-managed --record=/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/installed.txt \
	bdist_egg --dist-dir /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/dist
running build
running build_ext
running egg_info
creating /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info
writing /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/PKG-INFO
writing top-level names to /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/top_level.txt
writing dependency_links to /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/dependency_links.txt
writing manifest file '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/SOURCES.txt'
reading manifest file '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/SOURCES.txt'
writing manifest file '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info/SOURCES.txt'
running install
running install_lib
creating /builddir/build/BUILDROOT/afflib-3.7.15-1.fc26.s390x/usr/lib64/python2.7
creating /builddir/build/BUILDROOT/afflib-3.7.15-1.fc26.s390x/usr/lib64/python2.7/site-packages
copying /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/build/lib.linux-s390x-2.7/pyaff.so -> /builddir/build/BUILDROOT/afflib-3.7.15-1.fc26.s390x/usr/lib64/python2.7/site-packages
running install_egg_info
Copying /builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff/PyAFF.egg-info to /builddir/build/BUILDROOT/afflib-3.7.15-1.fc26.s390x/usr/lib64/python2.7/site-packages/PyAFF-0.1-py2.7.egg-info
running install_scripts
Traceback (most recent call last):
  File "setup.py", line 24, in <module>
    ext_modules = pyaff)
  File "/usr/lib64/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.7/site-packages/setuptools/command/install.py", line 61, in run
    return orig.install.run(self)
  File "/usr/lib64/python2.7/distutils/command/install.py", line 575, in run
    self.run_command(cmd_name)
  File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.7/site-packages/setuptools/command/install_scripts.py", line 33, in run
    bs_cmd = (self.get_finalized_command('build_scripts', create=False) or
  File "/usr/lib64/python2.7/distutils/cmd.py", line 312, in get_finalized_command
    cmd_obj.ensure_finalized()
AttributeError: 'NoneType' object has no attribute 'ensure_finalized'
make[2]: Leaving directory '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff'
make[2]: *** [Makefile:470: install-exec-local] Error 1
make[1]: Leaving directory '/builddir/build/BUILD/AFFLIBv3-3.7.15/pyaff'
make[1]: *** [Makefile:354: install-am] Error 2
make: *** [Makefile:564: install-recursive] Error 1
RPM build errors:
error: Bad exit status from /var/tmp/rpm-tmp.f1gRES (%install)
    Bad exit status from /var/tmp/rpm-tmp.f1gRES (%install)
Child return code was: 1
EXCEPTION: [Error()]


for full logs please see https://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2510985


Version-Release number of selected component (if applicable):
afflib-3.7.15-1.fc26