コンパイル環境の設定が必要
https://jp.mathworks.com/matlabcentral/answers/243868-mex-can-t-find-compiler-after-xcode-7-update-r2015b
/Applications/MATLAB_R2016a.app/bin/maci64/mexopts/clang_maci64.xml
を編集
<dirExists name="$$/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk" /> <dirExists name="$$/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk" /> <dirExists name="$$/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk" />
みたいに10.12を入れる
