# GNAT toolchain now broken after OS upgrade to MacOS 26 (Tahoe), arm64

**URL:** https://forum.ada-lang.io/t/gnat-toolchain-now-broken-after-os-upgrade-to-macos-26-tahoe-arm64/3843
**Category:** General
**Created:** [September 19, 2025, 1:03am UTC](https://forum.ada-lang.io/t/gnat-toolchain-now-broken-after-os-upgrade-to-macos-26-tahoe-arm64/3843 "2025-09-19T01:03:36Z")
**Posts on this page:** 1
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### Author: ![Ret\_Build\_Engineer](https://forum.ada-lang.io/letter_avatar_proxy/v4/letter/r/ccd318/32.png) [@Ret\_Build\_Engineer](https://forum.ada-lang.io/u/Ret_Build_Engineer)
#### Post date: [September 21, 2025, 4:32pm UTC](https://forum.ada-lang.io/t/gnat-toolchain-now-broken-after-os-upgrade-to-macos-26-tahoe-arm64/3843/8 "2025-09-21T16:32:14Z")

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Hi Fer;

Thanks for sharing this info.

Could someone assist me in translating this to what I should use when calling gnatmake directly, no Alire, no gpr…?

Thanks,

RBE

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