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Need to remove easy_install usage from doc/Makefile

See original GitHub issue

There’s still an easy_install usage in that Makefile, which gets invoked via make dist. That is going to break in the near future; easy_install was removed from setuptools three days ago.

Here’s a stab at a fix, not quite right though because we shouldn’t be invoking pip - it is much smarter now so when you point it at a wheel to install and that wheel provides numpy, that messes with the list of packages it knows it already has installed. Maybe we should just manually unzip the wheel instead.

diff --git a/doc/Makefile b/doc/Makefile
index 68d496389e..11c4145c95 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -65,12 +65,7 @@ gitwash-update:
 #------------------------------------------------------------------------------
 
 # Build the current numpy version, and extract docs from it.
-# We have to be careful of some issues:
-#
-# - Everything must be done using the same Python version
-# - We must use eggs (otherwise they might override PYTHONPATH on import).
-# - Different versions of easy_install install to different directories (!)
-#
+# Note: be careful here to use the same Python version
 
 
 INSTALL_DIR = $(CURDIR)/build/inst-dist
@@ -116,10 +111,11 @@ real-dist: dist-build html-build
        find build/dist -type d -print0 | xargs -0r chmod g+s
 
 dist-build:
-       rm -f ../dist/*.egg
-       cd .. && $(PYTHON) setup.py bdist_egg
+       rm -f ../dist/*.whl
+       cd .. && $(PYTHON) setup.py bdist_wheel
        install -d $(subst :, ,$(INSTALL_PPH))
-       $(PYTHON) `which easy_install` --prefix=$(INSTALL_DIR) ../dist/*.egg
+       # FIXME: cannot use pip, because it will mess with the already-install numpy version even if given a prefix
+       $(PYTHON) -m pip install --no-warn-conflicts --prefix=$(INSTALL_DIR) ../dist/*.whl