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conan install imagl/0.1.2@ --build=imagl --profile:host=/Users/jenkins/w/BuildSingleReference@2/20105/9de7eea3-597b-41b7-8b01-2cf21941268b/profile_host.txt --profile:build=default
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Configuration (profile_host):
[settings]
arch=armv8
build_type=Debug
compiler=apple-clang
compiler.libcxx=libc++
compiler.version=12.0
os=Macos
[options]
imagl:shared=True
[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]

Your compiler is apple-clang 12.0 and is compatible.
imagl/0.1.2: Forced build from source
Installing package: imagl/0.1.2
Requirements
    imagl/0.1.2 from 'TapaholesList-185' - Cache
    libpng/1.6.37 from 'conan-center' - Cache
    zlib/1.2.11 from 'conan-center' - Cache
Packages
    imagl/0.1.2:c4fe0b71091a229d7b3f85b625cb4d0976cff16b - Build
    libpng/1.6.37:4dc30494e16aa1c3afe30e47a9e1ab6be09c245e - Missing
    zlib/1.2.11:baf78352c82543f997ec32332829b6fa30714eaa - Download

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

ERROR: Missing binary: libpng/1.6.37:4dc30494e16aa1c3afe30e47a9e1ab6be09c245e
libpng/1.6.37: WARN: Can't find a 'libpng/1.6.37' package for the specified settings, options and dependencies:
- Settings: arch=armv8, build_type=Debug, compiler=apple-clang, compiler.version=12.0, os=Macos
- Options: api_prefix=None, fPIC=True, shared=False, zlib:fPIC=True, zlib:minizip=deprecated, zlib:shared=False
- Dependencies: zlib/1.2.11
- Requirements: zlib/1.Y.Z
- Package ID: 4dc30494e16aa1c3afe30e47a9e1ab6be09c245e

ERROR: Missing prebuilt package for 'libpng/1.6.37'
Try to build from sources with '--build=libpng'
Use 'conan search <reference> --table table.html'
Or read 'http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package'