Error building zeroc-ice in OSX M1

[marimeireles]

Hello!
I had a build problem while trying to install omero-rdf on the M1.
I've fixed it and decided to open an issue to inform people who might run into the same.

Here's the log:

  Building wheel for zeroc-ice (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> [219 lines of output]
      /private/var/folders/g6/qd_x54cj6xl6qqnjlz6wc5fc0000gq/T/pip-install-yk4gh7xn/zeroc-ice_7657974f264743e5bf3ee2653c2d176a/setup.py:111: SyntaxWarning: "is not" with 'str' literal. Did you mean "!="?
        if platform is not 'freebsd':
      WARNING: '' not a valid package name; please use only .-separated package names in setup.py
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Session_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Locator_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Properties_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_FileParser_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceStorm_Metrics_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IcePatch2_FileServer_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_RouterF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ServantLocatorF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Logger_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ObjectAdapterF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ConnectionF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ImplicitContextF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Endpoint_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Observer_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Admin_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_InstrumentationF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_LocatorF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_PropertiesAdmin_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/slice2py.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_LocalException_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ObjectFactory_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Communicator_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_Metrics_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_UserAccountMapper_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_FacetMap_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_Session_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_PermissionsVerifierF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ImplicitContext_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Plugin_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Instrumentation_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_CommunicatorF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Version_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Current_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_BuiltinSequences_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Identity_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Router_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Descriptor_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_RouterF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_SSLInfo_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Process_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Registry_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Connection_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceBox_IceBox_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Exception_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IcePatch2_FileInfo_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_SliceChecksumDict_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ObjectFactoryF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_LoggerF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_PropertiesF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Locator_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_Router_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceGrid_Query_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_PluginF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ObjectAdapter_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_Metrics_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ServantLocator_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_EndpointTypes_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Glacier2_PermissionsVerifier_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_EndpointF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/IceStorm_IceStorm_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_ProcessF_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      copying lib/Ice_RemoteLogger_ice.py -> build/lib.macosx-11.0-arm64-cpython-312
      creating build/lib.macosx-11.0-arm64-cpython-312/IceGrid
      copying lib/IceGrid/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/IceGrid
      creating build/lib.macosx-11.0-arm64-cpython-312/IceMX
      copying lib/IceMX/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/IceMX
      creating build/lib.macosx-11.0-arm64-cpython-312/IcePatch2
      copying lib/IcePatch2/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/IcePatch2
      creating build/lib.macosx-11.0-arm64-cpython-312/IceStorm
      copying lib/IceStorm/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/IceStorm
      creating build/lib.macosx-11.0-arm64-cpython-312/IceBox
      copying lib/IceBox/__init__.py -> build/lib.macosx-11.0-arm64-cpython-312/IceBox
      creating build/lib.macosx-11.0-arm64-cpython-312/slice
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/UserAccountMapper.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/FileParser.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Registry.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Session.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Locator.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Observer.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/PluginFacade.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Admin.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Descriptor.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Query.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      copying lib/slice/IceGrid/Exception.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceGrid
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/Transaction.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/Connection.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/TransactionalEvictor.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/CatalogData.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/ConnectionF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/EvictorF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/EvictorStorage.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/DB.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/BackgroundSaveEvictor.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/Exception.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      copying lib/slice/Freeze/Evictor.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Freeze
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceDiscovery
      copying lib/slice/IceDiscovery/IceDiscovery.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceDiscovery
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IcePatch2
      copying lib/slice/IcePatch2/FileServer.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IcePatch2
      copying lib/slice/IcePatch2/FileInfo.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IcePatch2
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ObjectAdapter.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/SliceChecksumDict.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ImplicitContextF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Logger.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Connection.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/RemoteLogger.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/PropertiesAdmin.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/EndpointF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Communicator.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Plugin.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ObjectAdapterF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Properties.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ConnectionF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/LocalException.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Locator.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/PluginF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/PropertiesF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/BuiltinSequences.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Version.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ObjectFactoryF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ServantLocator.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/InstrumentationF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Router.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Endpoint.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Metrics.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ObjectFactory.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Instrumentation.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Identity.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/LoggerF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/LocatorF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/EndpointTypes.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/CommunicatorF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Current.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ProcessF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/RouterF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/Process.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ImplicitContext.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/FacetMap.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      copying lib/slice/Ice/ServantLocatorF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Ice
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/Session.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/PermissionsVerifier.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/PermissionsVerifierF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/SSLInfo.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/Router.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/Metrics.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      copying lib/slice/Glacier2/RouterF.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/Glacier2
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceStorm
      copying lib/slice/IceStorm/IceStorm.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceStorm
      copying lib/slice/IceStorm/Metrics.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceStorm
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceLocatorDiscovery
      copying lib/slice/IceLocatorDiscovery/IceLocatorDiscovery.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceLocatorDiscovery
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceSSL
      copying lib/slice/IceSSL/EndpointInfo.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceSSL
      copying lib/slice/IceSSL/ConnectionInfo.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceSSL
      creating build/lib.macosx-11.0-arm64-cpython-312/slice/IceBox
      copying lib/slice/IceBox/IceBox.ice -> build/lib.macosx-11.0-arm64-cpython-312/slice/IceBox
      running build_ext
      building 'IcePy' extension
      creating build/temp.macosx-11.0-arm64-cpython-312
      creating build/temp.macosx-11.0-arm64-cpython-312/src
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/Ice
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/IceDiscovery
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/IceLocatorDiscovery
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/IceSSL
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/IceUtil
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/cpp/src/Slice
      creating build/temp.macosx-11.0-arm64-cpython-312/src/ice/mcpp
      clang -fno-strict-overflow -DNDEBUG -O2 -Wall -fPIC -O2 -isystem /Users/meireles/micromamba/envs/sparql/include -fPIC -O2 -isystem /Users/meireles/micromamba/envs/sparql/include -arch x86_64 -DICE_STATIC_LIBS -Isrc -Isrc/ice/cpp/include -Isrc/ice/cpp/src -I/Users/meireles/micromamba/envs/sparql/include/python3.12 -c src/BatchRequestInterceptor.cpp -o build/temp.macosx-11.0-arm64-cpython-312/src/BatchRequestInterceptor.o -w
      In file included from src/BatchRequestInterceptor.cpp:13:
      In file included from src/BatchRequestInterceptor.h:13:
      In file included from src/Config.h:28:
      In file included from /Users/meireles/micromamba/envs/sparql/include/python3.12/Python.h:23:
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/stdlib.h:148:34: error: unknown type name 'ldiv_t'
      inline _LIBCPP_INLINE_VISIBILITY ldiv_t div(long __x, long __y) _NOEXCEPT {
                                       ^
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/stdlib.h:149:12: error: no member named 'ldiv' in the global namespace
        return ::ldiv(__x, __y);
               ~~^
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/stdlib.h:152:34: error: unknown type name 'lldiv_t'
      inline _LIBCPP_INLINE_VISIBILITY lldiv_t div(long long __x,
                                       ^
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/stdlib.h:154:12: error: no member named 'lldiv' in the global namespace
        return ::lldiv(__x, __y);
               ~~^
      In file included from src/BatchRequestInterceptor.cpp:13:
      In file included from src/BatchRequestInterceptor.h:13:
      In file included from src/Config.h:28:
      In file included from /Users/meireles/micromamba/envs/sparql/include/python3.12/Python.h:26:
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/string.h:94:102: error: unknown type name 'size_t'
      inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const void* memchr(const void* __s, int __c, size_t __n) {
                                                                                                           ^
      /Users/meireles/micromamba/envs/sparql/bin/../include/c++/v1/string.h:97:90: error: unknown type name 'size_t'
      inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD void* memchr(void* __s, int __c, size_t __n) {
                                                                                               ^
      In file included from src/BatchRequestInterceptor.cpp:13:
      In file included from src/BatchRequestInterceptor.h:13:
      In file included from src/Config.h:28:
      /Users/meireles/micromamba/envs/sparql/include/python3.12/Python.h:29:12: fatal error: 'unistd.h' file not found
      #  include <unistd.h>
                 ^~~~~~~~~~
      7 errors generated.
      error: command '/Users/meireles/micromamba/envs/sparql/bin/clang' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for zeroc-ice
  Running setup.py clean for zeroc-ice
Failed to build zeroc-ice
ERROR: Could not build wheels for zeroc-ice, which is required to install pyproject.toml-based projects

I'm not entirely sure why but omero-py is not compatible with the M1 and requires python=3.9.
So one must:

1. Install python=3.9
2. Install zeroc-ice from conda-forge
3. Install omero-py from conda-forge

And now it's possible to successfully install it on the M1 using pip.
I can fix this by accomplishing #12 : )

[joshmoore]

The problem stems from the lack of m1 builds on GitHub (previously at least). All the workarounds you list make sense to me. 👍 Thanks for the feedback.