Build fails with MacOS 26

[theoparis]

/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk/System/Library/Frameworks/Foundation.framework/Modules/Foundation.swiftmodule/arm64e-apple-macos.swiftinterface:21692:18: error: 'init(__dsoHandle:)' is only available in macOS 26.0 or newer; clients of 'Foundation' may have a lower deployment target
21685 |   #endif
21686 | }
21687 | extension Foundation.Bundle {
      | `- note: add '@available' attribute to enclosing extension
21688 |   #if compiler(>=5.3) && $NonescapableTypes
21689 |   @available(macOS 12, iOS 15, tvOS 15, watchOS 8, visionOS 1, *)
21690 |   @_alwaysEmitIntoClient convenience public init?(_dsoHandle: Swift.UnsafeRawPointer) {
21691 |         if #available(macOS 16, iOS 19, tvOS 19, watchOS 9, visionOS 3, *) {
21692 |             self.init(__dsoHandle: _dsoHandle)
      |                  |- error: 'init(__dsoHandle:)' is only available in macOS 26.0 or newer; clients of 'Foundation' may have a lower deployment target
      |                  `- note: add 'if #available' version check
21693 |             return
21694 |         } in https://github.com/swiftlang/swift-driver.git

1. Install macos 26 beta (and/or xcode beta 26)
2. git clone https://github.com/swiftlang/swift-build
3. swift build -c release

Someone seemed to have the same problem with containerization and I'm not really clear on what the correct solution is..
I tried both swift 6.1.2 and swift 6.2-dev (main-snapshot)

[owenv]

Building using the Xcode 26 SDKs requires either using the compiler provided with Xcode 26, or a swift.org compiler containing this change, which is not yet available in nightly snapshots: swiftlang/swift#82153. I believe that's the issue you're running into here

[theoparis]

Ok, thanks. Using export PATH=/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin:$PATH does seem to help.