message: tools: remove $ to prevent a user from copying it
diff: @@ -24,7 +24,7 @@ command -v ${protoc_binary} > /dev/null && command -v ${protoc_grpc_binary} > /d
  echo >&2 ""
  echo >&2 "You may want to run the CMake configure step first:"
  echo >&2 ""
  - echo >&2 " $ cmake -DBUILD_BACKEND=ON -Bbuild/default -H."
  + echo >&2 " cmake -DBUILD_BACKEND=ON -Bbuild/default -H."
  exit 1
  }
  