What happens if I push all of nixpkgs
nixpkgs doc hooks xcbuild.section.md
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xcbuildHook {#xcbuildhook} #

Overrides the build and install phases to run the "xcbuild" command. This hook is needed when a project only comes with build files for the XCode build system. You can disable this behavior by setting buildPhase and configurePhase to a custom value. xcbuildFlags controls flags passed only to xcbuild.