```suggestion It's best to contribute to our latest branch, even if you're still on an earlier version of Ubuntu. However our latest branch does not support older versions of ROS such as ROS Indigo. Use the following command to build older releases from source: ```

```suggestion Here we show some examples using ``catkin_tools``. Note: If you have already built these packages in your workspace you will need to use ``catkin clean`` first. ```

```suggestion - ``rm -rf /path/to/package/directory`` ```

```suggestion - ``touch /path/to/package/directory/CATKIN_IGNORE`` ```

```suggestion You can exclude packages from a build in several ways: ```

```suggestion Be careful not to disable packages that are needed by others (ie: are a dependency of other packages). ```

```suggestion If you would like to reduce your compile time or only need to build a subset of all the packages, `catkin` allows you to configure only a subset of packages to include in a build. ```

```suggestion MoveIt is a large project and the default compile time can easily take around 30 minutes. ```

```suggestion ## Optional: Excluding Packages from a Build ```

```suggestion By default, we will assume you are building the latest branch - `master`. ```

```suggestion This branch builds for ROS Kinetic and newer, e.g. on Ubuntu 16.04 and newer. ```

```suggestion Note, every command to ``catkin config --blacklist`` will override the previous list by default. Using the option ``--append-args`` you can augment the existing blacklist. ```