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This is because you cloned the indigo-devel branch by default, which will not work on hydro.

Why not just install the binaries via apt-get?

sudo apt-get install ros-hydro-pointcloud-to-laserscan

This is because you cloned the repo, but did not install any dependencies. To install dependencies you would run:

rosdep install --from-paths src --ignore-src --rosdistro hydro -y

Incidentally you cloned the indigo-devel branch by default, which will not work on hydro.

Why not just install the binaries via apt-get?

sudo apt-get install ros-hydro-pointcloud-to-laserscan

This is because you cloned the repo, but did not install any dependencies. To install dependencies you would run:

rosdep install --from-paths src --ignore-src --rosdistro hydro -y

Incidentally you cloned the indigo-devel branch by default, which will not work on hydro.

Why not just install the binaries via apt-get?apt-get? This will pull in all dependencies automatically:

sudo apt-get install ros-hydro-pointcloud-to-laserscan