Xcode updates 

After each update of Xcode, do not forget to open it and install the command line tool.
Then in terminal, do:

sudo xcodebuild -license



This command is not necessary if you open Xcode and install command line tools:


sudo xcode-select --install

For older version of Xcode:
Install the sdk headers for version 10.14 with:


open  /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg


They are installed with 10.15 version. Check using:


cd /Library/Developer/CommandLineTools/SDKs
(base) marcgirondot@MacBook-Air-de-Marc SDKs % ls -al
total 0
drwxr-xr-x  5 root  wheel  160 11 déc  2019 .
drwxr-xr-x  5 root  wheel  160 15 nov  2019 ..
lrwxr-xr-x  1 root  wheel   15 11 déc  2019 MacOSX.sdk -> MacOSX10.15.sdk
drwxr-xr-x  7 root  wheel  224 11 déc  2019 MacOSX10.14.sdk
drwxr-xr-x  8 root  wheel  256 11 déc  2019 MacOSX10.15.sdk


































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