Fix makefile

Makefile

@@ -5,29 +5,34 @@ all : commands
 commands :
  @grep -h -E '^##' ${MAKEFILE_LIST} | sed -e 's/## //g' | column -t -s ':'
 
+# Create copy of glossary file for GitHub Pages site.
 _data/glossary.yml : ./glossary.yml
  @mkdir -p _data
  @cp $< $@
 
+## sort : sort the glossary file and build _data glossary file per language
 sort-glossary : _data/glossary.yml
  @yamllint glossary.yml
  @python utils/sort-glossary.py
 
 ## site : rebuild GitHub Pages site locally.
-site : sort-glossary
+site :
+ $(MAKE) sort-glossary
  rm -rf .jekyll-cache .jekyll-metadata _site
  bundle exec jekyll build
 
 ## gh-site : builds the website for GitHub pages (part of the GH Actions workflow)
-gh-site : sort-glossary
+gh-site : _data/glossary.yml
+ $(MAKE) sort-glossary
  @rm -rf _gh-site
  @mkdir -p _gh-site
  @cp -r `ls -A | grep -v '.git' | grep -v '_gh-site' | grep -v '_site'` _gh-site
  @mkdir -p _gh-site/_data
  @cp $< _gh-site/$<
 
 ## serve : serve GitHub Pages site locally.
-serve : sort-glossary
+serve :
+ $(MAKE) sort-glossary
  rm -rf _site
  bundle exec jekyll serve -I