We have no matplotlib packaged yet.

--- pyparsing-3.2.1/tox.ini.orig
+++ pyparsing-3.2.1/tox.ini
@@ -7,7 +7,6 @@
 [testenv]
 deps=
     pytest
-    matplotlib; implementation_name != 'pypy'
 extras=diagrams
 commands=
     pytest tests {posargs}