Mac appium.dmg. Xcode Command Line Tools

You need to install the command line tools as marked in your message:

✖ Xcode Command Line Tools are NOT installed

From osxDaily:

1. Launch the Terminal, found in /Applications/Utilities/

2. Type the following command string:

   xcode-select --install
   

3. A software update popup window will appear that asks: “The xcode-select command requires the command line developer tools. Would you like to install the tools now?” choose to confirm this by clicking “Install”, then agree to the Terms of Service when requested (feel free to read them thoroughly, we’ll be here)

4. Wait for the Command Line Tools package download to complete, it’ll be about 130MB and installs fairly quickly depending on your connection speed

The installer goes away on its own when complete, and you can then confirm everything is working by trying to use one of the commands that were just installed, like gcc, git, svn, rebase, make, ld, otool, nm, whatever you want from the list below. Assuming the installation went uninterrupted, the command will execute as expected. This also means you can compile and install things from source code directly without having to use a package manager. Enjoy your new unix command line toolkit!