In the WebDriverAgentLib target, go to the Build Settings tab.

In Xcode, go to File->Project Settings and change the Build System to “Legacy Build System”.

NOTE: You will need to do the following to get it to compile in Xcode10:

In Xcode 10.1, build the Appium WebDriverAgent project (located in /Users//.nvm/versions/node//lib/node_modules/appium/node_modules/appium-xcuitest-driver ).Set the default version of Xcode to 10.1 via sudo xcode-select -s /Applications/Xcode.app/Contents/Developer.Name the Xcode9.4.1 application to Xcode9.4.1.Extract and install Xcode9.4.1 into your /Applications folder, choosing “Keep Both” when prompted to overwrite.Download Xcode9.4.1 from the Apple Developer Center:.

Install Xcode10.1 from the App Store as your default version.Install Appium 1.8.1 via npm install -g Install Katalon Studio 5.10.0 (latest).I can tell you that I have Katalon Studio 5.10.1 and Appium 1.8.1 on my machine with both Xcode 9.4.1 and 10.1 running side-by-side and I’m able to run Katalon tests.

Xcode download 10.1