make meson use python3 in a non-coercive way

component/libepoxy/buildout.cfg

@@ -19,7 +19,7 @@ configure-command =
   echo "current working directory is `pwd`" 
   sed -i '20s/value: true/value: false/' meson_options.txt 
   mkdir build && cd build 
-   ${buildout:directory}/bin/${meson:egg} --prefix=%(prefix)s 
+   ${meson:location}/bin/meson --prefix=%(prefix)s 
     
 make-binary = cd build && ${ninja:location}/ninja
 environment =

component/meson/buildout.cfg

@@ -3,12 +3,18 @@
 extends = 
   ../../component/python3/buildout.cfg
 
-#needs python=python3 in sr
 
 parts = meson
 
 [meson]
 
-recipe = zc.recipe.egg:scripts
-egg = meson
+#recipe = zc.recipe.egg:scripts
+#egg = meson
+recipe = plone.recipe.command
+command =
+  bash -c "${python3:executable} -m venv --clear ${:location} && \
+    . ${:location}/bin/activate && \
+    pip install meson==0.52 --prefix ${:location}"
+location = ${buildout:parts-directory}/${:_buildout_section_name_}
+stop-on-error = true