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conan install moc/0.9.401@ --build=moc --profile:host=/Users/jenkins/w/BuildSingleReference@2/20557/40ef234b-52d6-40e8-a31d-3d91458aeab9/profile_host.txt --profile:build=default
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Configuration (profile_host):
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=12.0
os=Macos
[options]
[build_requires]
[env]

Configuration (profile_build):
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=12.0
os=Macos
os_build=Macos
[options]
[build_requires]
[env]

moc/0.9.401: Forced build from source
Installing package: moc/0.9.401
Requirements
    bison/3.7.1 from 'conan-center' - Cache
    flex/2.6.4 from 'conan-center' - Cache
    m4/1.4.18 from 'conan-center' - Cache
    moc/0.9.401 from local cache - Cache
Packages
    bison/3.7.1:08b63e87dd6803cb925df6e854a79a2d61c32575 - Download
    flex/2.6.4:08b63e87dd6803cb925df6e854a79a2d61c32575 - Missing
    m4/1.4.18:3eb32b976fb0626f3c40a8b87ace72156aa44204 - Download
    moc/0.9.401:d72e9ecf1ed04fe149e99b0360bed56514a0b6ac - Build

Cross-build from 'Macos:x86_64' to 'Macos:armv8'
Installing (downloading, building) binaries...

ERROR: Missing binary: flex/2.6.4:08b63e87dd6803cb925df6e854a79a2d61c32575
flex/2.6.4: WARN: Can't find a 'flex/2.6.4' package for the specified settings, options and dependencies:
- Settings: arch=armv8, build_type=Release, compiler=apple-clang, compiler.version=12.0, os=Macos
- Options: fPIC=True, shared=False
- Dependencies: m4/1.4.18
- Requirements: m4/1.Y.Z
- Package ID: 08b63e87dd6803cb925df6e854a79a2d61c32575

ERROR: Missing prebuilt package for 'flex/2.6.4'
Try to build from sources with '--build=flex'
Use 'conan search <reference> --table table.html'
Or read 'http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package'