MacでThe CXX compiler identification is unknown や CMAKE_CXX_COMPILER could be foundが出たときの対応

Karabiner-Elementsのmake中にエラーが出てしまった。

% cd ~/Downloads/Karabiner-Elements-version_12.1.0
% make

make -C ../lib/KarabinerKit
make -C ../../../lib/libkrbn
mkdir -p build_xcode \
		&& cd build_xcode \
		&& cmake -G Xcode .. \
		&& xcodebuild -configuration Release SYMROOT="/Users/cd0054/Downloads/Karabiner-Elements/src/lib/libkrbn/build_xcode/build"
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:5 (project):
  No CMAKE_C_COMPILER could be found.



CMake Error at CMakeLists.txt:5 (project):
  No CMAKE_CXX_COMPILER could be found.



-- Configuring incomplete, errors occurred!

Xcode Commandline Toolsのパス解決がおかしかったようで、下記コマンドを実行後、makeが通るようになった。

sudo xcode-select --reset