Xcode 11 Catalina

Question or issue on macOS:

Xcode - 11.3.1; macOS - 10.14.6; iOS - 14.2; The App Store says I need to have at least macOS 10.15.4 to download the latest Xcode. The upgrade to Big Sur is huge and I'm running fairly low on space on my Mac, so I'd rather just upgrade to Catalina, but I can't seem to find a standalone download (i.e., not an update that requires already having. As per Xcode 11.1 Release Notes, it is a known issue when trying to update to Xcode 11.1. To solve the issue, use the suggested workaround - delete the existing Xcode.app or temporarily change the Xcode.app file extension. Xcode may fail to update from the Mac App Store after updating to macOS Catalina.

Configure and build xdebug on macOS Catalina. The reason for these errors is that the /usr/include folder is missing because Apple removed it when they released Xcode 11. But, you can work around this problem. Here is how: First, you need to make sure that Xcode and the command line tools installed. Edit 2: It seems to be downloading very slowly; perhaps Apple's download servers are overloaded from people updating to the latest iOS release. I've been trying to install Xcode 12.5 from the App Store, although each time, it stops downloading at exactly 388 MB. This persists when cancelling and restarting the download, and even across a reboot.

I have Catalina macOS version (10.15) installed and still the canvas is not showing up.

The error message I get from Xcode is

How to solve this problem?

Solution no. 1:

I filled a Radar FB6123260 please do that also. For me resetting the nvram worked and deleting derived data.

CatalinaXcodeXcode

Deleting derived data:

Xcode 11 requires catalina

Solution no. 2:

Add your new files to the compiled bundles as part of the build phases?
Not only does the target need to be set for the file- but it also has to be included in the compiled bundles..

Project -> Target -> Build Phases -> search for the file your are trying to work on

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Hope this helps!