--- Makefile	2018-11-23 11:26:12.713369000 +0100
+++ Makefile	2018-12-02 09:37:12.614621000 +0100
@@ -105,7 +105,7 @@ 
 		${WRKSRC}/setup.cfg
 
 post-install:
-	@${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR}/matplotlib -name '*.so' \
+	@${FIND} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/matplotlib -name '*.so' \
 		| ${XARGS} ${STRIP_CMD}
 
 post-install-EXAMPLES-on: