https://codereview.appspot.com/549810043/diff/567420043/python/GNUmakefile File python/GNUmakefile (right):
https://codereview.appspot.com/549810043/diff/567420043/python/GNUmakefile#newcode20 python/GNUmakefile:20: INSTALLATION_OUT_SUFFIXES = 2 please drop entirely https://codereview.appspot.com/549810043/diff/567420043/python/GNUmakefile#newcode26 python/GNUmakefile:26: INSTALLATION_OUT_FILES2 = $(wildcard $(outdir)/__pycache__/*.pyc) Can be INSTALLATION_OUT_DIR and INSTALLATION_OUT_FILES without suffix https://codereview.appspot.com/549810043/diff/567420043/python/GNUmakefile#newcode29 python/GNUmakefile:29: $(PYTHON) -B $< I'd propose to leave this out of the patch for now and address this after releasing 2.21.0 https://codereview.appspot.com/549810043/