Bug#915755: zope2.13 FTBFS with python-pip 18.1

[Adrian Bunk]

Source: zope2.13
Version: 2.13.22-1
Severity: serious
Tags: ftbfs buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/zope2.13.html

...
  debian/rules override_dh_auto_build
make[1]: Entering directory '/build/1st/zope2.13-2.13.22'
make PYTHON=python2.7 \
     DIST_EXCLUSIONS=Docutils:distribute:mechanize:initgroups:pip:pytz
make[2]: Entering directory '/build/1st/zope2.13-2.13.22'
Cleaning...
rm -rf ./build
find ./source/ -maxdepth 2 -type d -name "build" -exec rm -rf {} \;
Building Zope2 2.13...
Traceback (most recent call last):
  File "./debian/build-scripts/build.py", line 249, in <module>
    main()
  File "./debian/build-scripts/build.py", line 230, in main
    base_build_dir=tmp_install_area)
  File "./debian/build-scripts/build.py", line 79, in install_dist
    from pip.req import InstallRequirement
ImportError: No module named req
make[2]: *** [Makefile:36: build] Error 1