Update Makefile

Solve make htmldoc error on python3 ubuntu

diff --git a/Makefile b/Makefile
index 03c6a0d6fab44ea10284ea45db15bda8cecf8445..b52ba22f72382b1573d54591ac4e17e6ab848e3f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -156,6 +156,7 @@ phpdoc: clean
 htmldoc:
        python3 -m venv venv/
        bash -c 'source venv/bin/activate; \
+       pip install wheel; \
        pip install mkdocs; \
        mkdocs build --clean'
        find doc/html/ -type f -exec chmod a-x '{}' \;