# Regression: Xcode 15 can't build Swift for macOS earlier than 10.15

**URL:** <https://forums.swift.org/t/regression-xcode-15-cant-build-swift-for-macos-earlier-than-10-15/66986>\
**Category:** Compiler\
**Tags:** bug\
**Created:** [August 28, 2023, 1:21pm UTC](https://forums.swift.org/t/regression-xcode-15-cant-build-swift-for-macos-earlier-than-10-15/66986 "2023-08-28T13:21:28Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![jrose](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/jrose/32/408_2.png) [@jrose](https://forums.swift.org/u/jrose)\
**Post date:** [August 29, 2023, 1:43am UTC](https://forums.swift.org/t/regression-xcode-15-cant-build-swift-for-macos-earlier-than-10-15/66986/4 "2023-08-29T01:43:10Z")

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The command-line thing has been that way for a while!

[https://support.apple.com/kb/DL1998](https://support.apple.com/kb/DL1998)

> **[Swift 5 Release Notes for Xcode 10.2 | Apple Developer Documentation](https://developer.apple.com/documentation/xcode-release-notes/swift-5-release-notes-for-xcode-10_2#Swift-5-Runtime-Support-for-Command-Line-Tools-Package)**
>
> Update your code to use new language features and test your apps against changes.

But the “incompatible version” error here definitely makes it look like something else has changed. Hopefully a current Apple person will provide an answer soon.

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_[View the full topic](https://forums.swift.org/t/regression-xcode-15-cant-build-swift-for-macos-earlier-than-10-15/66986)._