Let's install the multimaster_fkie package from the source:

1. For this, we need to install pip on our system. You can use the following command to do so:

$ sudo apt install python-pip

2. Once pip is installed, clone the multimaster repository into your workspace and build the package using the following commands:

$ cd chapter_6_ws/src
$ git clone https://github.com/fkie/multimaster_fkie.git multimaster
$ rosdep update
$ rosdep install -i --as-root pip:false --reinstall --from-paths multimaster

You will be prompted to accept a few dependency installations after running the preceding command; ensure you accept all the dependency installations. Once the dependencies have been installed, you can build the workspace.

3. Let's use the catkin_make_isolated command this time to build the workspace. This command helps build the packages individually and not as a whole:

$ cd ..
$ catkin_build_isolated

Now that the installation has been set, let's try using this package.