qt5base: apple silicon: fails to build

[hexagonal-sun]

Describe the bug
Bulding qt5.qtbase fails on apple silicon. See the hydra log. It looks as though the x86_64 linker is being invoked, see the bottom of the log. Specifically clang is being passed -triple x86_64-apple-macosx11.0.0.

To Reproduce
Steps to reproduce the behavior:
Build qt5.qtbase on apple silicon.

Expected behavior
it builds.

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: qt5.qtbase
# a list of nixos modules affected by the problem
module:

[stale]

I marked this as stale due to inactivity. → More info

[gsornsen]

I'm also running into this on apple silicon

Info: creating cache file /private/tmp/nix-build-qtbase-5.15.3.drv-0/qtbase-d16bf02/.qmake.cache
Command line: -prefix /nix/store/82dsf3ac7m6vpcwkrw7vd8v8gn2bc6va-qtbase-5.15.3 -plugindir '/nix/store/>
/private/tmp/nix-build-qtbase-5.15.3.drv-0/qtbase-d16bf02/mkspecs/features/mac/toolchain.prf:3: Cannot >
Info: creating stash file /private/tmp/nix-build-qtbase-5.15.3.drv-0/qtbase-d16bf02/.qmake.stash
Project ERROR: Cannot run compiler 'clang++'. Output:
===================
clang version 11.1.0
Target: aarch64-apple-darwin
Thread model: posix
InstalledDir: /nix/store/rb559z09mrinv0w8mm1clss8s6p8k2if-clang-11.1.0/bin
clang-11: warning: no such sysroot directory: '-g0' [-Wmissing-sysroot]
clang-11: warning: no such sysroot directory: '-g0' [-Wmissing-sysroot]
 "/nix/store/rb559z09mrinv0w8mm1clss8s6p8k2if-clang-11.1.0/bin/clang-11" -cc1 -triple x86_64-apple-maco>
error: unknown target CPU 'armv8.3-a+crypto+sha2+aes+crc+fp16+lse+simd+ras+rdm+rcpc'
note: valid target CPU values are: nocona, core2, penryn, bonnell, atom, silvermont, slm, goldmont, gol>
===================
Maybe you forgot to setup the environment?