DEV/MAINT: fix some build issues on macOS and a deprecation, add a Pixi config

.gitattributes

@@ -0,0 +1,2 @@
+# SCM syntax highlighting & preventing 3-way merges
+pixi.lock merge=binary linguist-language=YAML linguist-generated=true

.gitignore

@@ -3,3 +3,7 @@
 *~
 *.bak
 output-is-fine
+
+# pixi environments
+.pixi
+*.egg-info

Makefile

@@ -34,7 +34,7 @@ dist: html
 	rm build/dist/search.html
 	rm build/dist/searchindex.js
 	cd build/dist && tar czf ../dist.tar.gz *
-	chmod ug=rwX,o=rX -R build/dist
+	chmod -R ug=rwX,o=rX build/dist
 	find build/dist -type d -print0 | xargs -0r chmod g+s
 
 upload:
@@ -90,3 +90,6 @@ linkcheck:
 	@echo
 	@echo "Link check complete; look for any errors in the above output " \
 	      "or in build/linkcheck/output.txt."
+
+show:
+	@python -c "import webbrowser; webbrowser.open_new_tab('file://$(PWD)/build/html/index.html')"

conf.py

@@ -2,17 +2,18 @@
 
 import os
 import re
-import pkg_resources
 from datetime import date
 
+import packaging
+
 # -- General configuration -----------------------------------------------------
 
 extensions = []
 
 templates_path = ['_templates']
 source_suffix = '.rst'
 master_doc = 'index'
-exclude_patterns = ['scipy-sphinx-theme', 'README.rst']
+exclude_patterns = ['scipy-sphinx-theme', 'README.rst', '.pixi/*']
 
 # General information about the project.
 project = u'Numpy and Scipy documentation'
@@ -27,7 +28,7 @@
     index_text = f.read()
 
 scipy_versions = set(re.findall('scipy-([0-9.]{3,})', index_text))
-scipy_latest_version = str(max(pkg_resources.parse_version(x) for x in scipy_versions if not x.startswith('0.')))
+scipy_latest_version = str(max(packaging.version.parse(x) for x in scipy_versions if not x.startswith('0.')))
 numpy_latest_version = '> 1.17'
 
 # -- Options for HTML output ---------------------------------------------------