# Developer main unable to build packages **URL:** \ **Category:** Windows\ **Tags:** windows\ **Created:** [October 23, 2026, 7:31pm UTC](https://forums.swift.org/t/developer-main-unable-to-build-packages/90224 "2026-10-23T19:31:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![bkhouri](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/bkhouri/32/45895_2.png) [@bkhouri](https://forums.swift.org/u/bkhouri)\ **Post date:** [October 23, 2026, 7:31pm UTC](https://forums.swift.org/t/developer-main-unable-to-build-packages/90224/1 "2026-10-23T19:31:39Z")
Hello, I raised [Unable to build SwiftPM due to `error: could not build module '_Builtin_intrinsics'` · Issue #586 · swiftlang/swift-installer-scripts · GitHub](https://github.com/swiftlang/swift-installer-scripts/issues/586) a few days ago as I'm unable to use the EXE installer to build a Swift package. Does anyone have any ideas where the issue may be? ---
**Author:** ![compnerd](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/compnerd/32/2165_2.png) [@compnerd](https://forums.swift.org/u/compnerd)\ **Post date:** [October 23, 2026, 8:04pm UTC](https://forums.swift.org/t/developer-main-unable-to-build-packages/90224/2 "2026-10-23T20:04:02Z")
That really doesn't belong on the swift-installer-scripts repo, the installer is not responsible for issues related to clang. If you look at the error: ```swift 13 | #include | `- error: 'stdlib.h' file not found ``` it seems like a user error: missing a standard header implies that your Visual Studio installation is corrupt or missing. ---
**Author:** ![compnerd](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/compnerd/32/2165_2.png) [@compnerd](https://forums.swift.org/u/compnerd)\ **Post date:** [October 23, 2026, 8:05pm UTC](https://forums.swift.org/t/developer-main-unable-to-build-packages/90224/3 "2026-10-23T20:05:49Z")
I also wonder if it is a SPM issue: it could be that during the manifest build, SPM is not properly invoking the compiler?