# AU builds with "Legacy" build system but not "New" build system - why?

**URL:** <https://iplug2.discourse.group/t/au-builds-with-legacy-build-system-but-not-new-build-system-why/502>\
**Category:** macOS\
**Created:** [6 November 2021 21:45 UTC](https://iplug2.discourse.group/t/au-builds-with-legacy-build-system-but-not-new-build-system-why/502 "2021-11-06T21:45:23Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![RexMartin2](https://avatars.discourse-cdn.com/v4/letter/r/da6949/32.png) [@RexMartin2](https://iplug2.discourse.group/u/RexMartin2)\
**Post date:** [9 November 2021 21:21 UTC](https://iplug2.discourse.group/t/au-builds-with-legacy-build-system-but-not-new-build-system-why/502/2 "2021-11-09T21:21:52Z")

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I found my problem.

I have been using a low-level “helper” code for denormalizing that worked really well in the past but apparently is too old now. I commented out that code and the project builds as New Build System with no errors. This denormal code was also causing the arm64 build problem on this thread: [Successfully compiled for ARM/M1 - I thought!](https://iplug2.discourse.group/t/successfully-compiled-for-arm-m1-i-thought/500)

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