[2.7] bpo-31036: Allow sphinx and blurb to be found automatically. by benjaminp · Pull Request #16638 · python/cpython
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…-3440) Rather than requiring the path to blurb and/or sphinx-build to be specified to the make rule, enhance the Doc/Makefile to look for each first in a virtual environment created by make venv and, if not found, look on the normal process PATH. This allows the Doc/Makefile to take advantage of an installed spinx-build or blurb and, thus, do the right thing most of the time. Also, make the directory for the venv be configurable and document the `make venv` target.. (cherry picked from commit 590665c) Co-authored-by: Ned Deily <nad@python.org>