I've compiled and installed this to `~/KDE/install` and done:
```
export QT_PLUGIN_PATH=$QT_PLUGIN_PATH:$HOME/KDE/install/lib/x86_64-linux-gnu/plugins
export XDG_DATA_DIRS=$XDG_DATA_DIRS:$HOME/KDE/install/lib/x86_64-linux-gnu/plugins
kdevelop
```
but KDevelop did not see the plugin. I don't know how better to test this.