//1.檢查頭文件是否存在c++
$clang++ -E -x c++ - -v < /dev/nullxcode
ignoring nonexistent directory "/usr/include/c++/v1"
ignoring nonexistent directory "/usr/include"code
注:說明macOS SDK 的頭文件不存在select
//2.安裝xcode-selectdi
$xcode-select --install 文件
//3.獲取header pkgco
$xcode-select -p header
//4.查看configclang
$brew configconfig
//5.安裝頭文件
$ cd /Library/Developer/CommandLineTools/Packages/
$ open macOS_SDK_headers_for_macOS_10.14.pkg