Cannot install brew on Mojave with Xcode 10

Question

I can not install any brew packages on my mac with the following error info.

Installed on my Mac:

• macOS 10.14 Beta (18A293u)
• Xcode 9.3 (9E145)
• Xcode 10.0 beta (10L176w)

Type in brew install xxx. The output is:

Error: Your Xcode (9.3) is too outdated. Please update to Xcode 10.0 (or delete it). Xcode can be updated from https://developer.apple.com/download/more/  Error: Xcode alone is not sufficient on Mojave. Install the Command Line Tools: xcode-select --install 

But as I type in xcode-select --install, it says it is not available
Xcode select install error

Paths of two versions of Xcode on my Mac:

/Applications/Xcode-beta.app /Applications/Xcode.app 

And my config output:
xcode-select -p

/Applications/Xcode.app/Contents/Developer      

brew config

HOMEBREW_VERSION: 1.6.7 ORIGIN: https://github.com/Homebrew/brew HEAD: 22e9fd772926e389e264cfb328c3d810b06759f9 Last commit: 5 days ago Core tap ORIGIN: https://github.com/Homebrew/homebrew-core Core tap HEAD: 854bb90b366169915849fc9a83e941b8883cea1f Core tap last commit: 6 hours ago HOMEBREW_PREFIX: /usr/local CPU: octa-core 64-bit haswell Homebrew Ruby: 2.3.6 =>./System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Clang: 9.1 build 902 Git: 2.15.1 => /Applications/Xcode.app/Contents/Developer/usr/bin/git Curl: 7.54.0 => /usr/bin/curl Java: 1.8.0_131 macOS: 10.14-x86_64 CLT: N/A Xcode: 9.3 XQuartz: N/A 

Answer 1

You will need to install both "Xcode 10.0 Beta" from https://developer.apple.com/download/ AND "Command Line Tools (macOS 10.14) for Xcode 10 Beta" from

https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_macOS_10.14_for_Xcode_10/Command_Line_Tools_macOS_10.14_for_Xcode_10.dmg

Update contributed by other comments, after you installed "Command Line Tools", you will also need to execute the following command in your terminal.

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