I'm trying to install the Facebook SDK for Unity from this repo into my Unity project.

In the Readme it says:

BUILDING THE SDK
Setup the plugin binaries.
./scripts/setup.sh
Export the unitypackage
./scripts/package_sdk.sh

I'm very new to this so five me if its obvious what to do. I cloned the git and then I ran sh ./scripts/setup.sh from that directory. I received the following error:

sed: -e expression #1, char 76: unknown command: `U' Unity executable not found.

Running sh ./scripts/package_sdk.sh I get the same error.

Please advise me of what the correct thing to do is. Can I just copy the repo folders into my Unity project?