Xcode update - "Xcode 1.5 not supported"

Copy-pasting an answer from one of the LLMs (I don't remember which one, maybe duck.ai)

The CMake error "Xcode 1.5 not supported" when building on macOS 15.5 indicates a version mismatch between your CMake installation and your Xcode installation.

Understanding the Issue:

• Xcode 1.5 is a very old version of Apple's integrated development environment. It predates many modern macOS features and compiler toolchains.
• macOS 15.5 is a relatively recent operating system. This means it likely requires a much newer version of Xcode and its associated command-line tools to function correctly.
• CMake needs to be able to find and interact with a compatible Xcode installation: to generate build files and compile your project. If CMake detects an unsupported or outdated Xcode version, it will throw this error.

Resolving the Error:

• Update Xcode:

  The most likely solution is to update your Xcode installation to a version compatible with macOS 15.5.

  • Open the Mac App Store and search for "Xcode."
  • Download and install the latest available version.
  • After installation, open Xcode to complete any initial setup and agree to the license agreements.
• Install Xcode Command Line Tools:

  Even if you update Xcode, you might also need to explicitly install or update the Xcode Command Line Tools, as these contain the compilers and other utilities that CMake relies on.

  • Open Terminal and run the following command:

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        xcode-select --install

• Follow the on-screen prompts to complete the installation.

• Update CMake: While less likely to be the primary cause, ensuring you have a recent version of CMake is good practice.
  • If you installed CMake via Homebrew:

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        brew update
        brew upgrade cmake

• If you installed CMake manually, download the latest version from the official CMake website and follow the installation instructions.

• Verify Xcode Selection: Ensure that your system is pointing to the correct Xcode installation.
  • In Terminal, run:

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        xcode-select -p

• This should output the path to your current Xcode installation (e.g., /Applications/Xcode.app/Contents/Developer). If it's incorrect or points to an older version, you can set it using:

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        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

(Adjust the path if your Xcode is installed elsewhere).

After performing these steps, try running CMake again to generate your build files. The error should be resolved.