macOS 11.2 M1: local build error

[eliheuer]

As mentioned in this issue I can't use GitHub actions with a private repo, so I'm trying to build locally on macOS 11.2(M1).

Following the build instructions, when I try to build this repo I get the following error:

INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of fontmake to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install -r requirements.txt (line 2) because these package versions have conflicting dependencies.

The conflict is caused by:
    fontbakery 0.7.38 depends on cmarkgfm
    fontbakery 0.7.37 depends on cmarkgfm
    fontbakery 0.7.36 depends on cmarkgfm
    fontbakery 0.7.35 depends on cmarkgfm
    fontbakery 0.7.34 depends on ttfautohint-py
    fontbakery 0.7.33 depends on ttfautohint-py
    fontbakery 0.7.32 depends on ttfautohint-py
    fontbakery 0.7.31 depends on ttfautohint-py
    fontbakery 0.7.30 depends on ttfautohint-py
    fontbakery 0.7.29 depends on ttfautohint-py
    fontbakery 0.7.28 depends on ttfautohint-py
    fontbakery 0.7.27 depends on ttfautohint-py
    fontbakery 0.7.26 depends on ttfautohint-py
    fontbakery 0.7.25 depends on ttfautohint-py
    fontbakery 0.7.24 depends on ttfautohint-py
    fontbakery 0.7.23 depends on ttfautohint-py
    fontbakery 0.7.22 depends on ttfautohint-py
    fontbakery 0.7.21 depends on ttfautohint-py
    fontbakery 0.7.20 depends on ttfautohint-py
    fontbakery 0.7.19 depends on ttfautohint-py
    fontbakery 0.7.18 depends on ttfautohint-py
    fontbakery 0.7.17 depends on ttfautohint-py
    fontbakery 0.7.16 depends on ttfautohint-py
    fontbakery 0.7.15 depends on ttfautohint-py
    fontbakery 0.7.14 depends on ttfautohint-py
    fontbakery 0.7.13 depends on ttfautohint-py
    fontbakery 0.7.12 depends on ttfautohint-py
    fontbakery 0.7.11 depends on ttfautohint-py
    fontbakery 0.7.10 depends on ttfautohint-py
    fontbakery 0.7.9 depends on ttfautohint-py
    fontbakery 0.7.8 depends on ttfautohint-py
    fontbakery 0.7.7 depends on ttfautohint-py
    fontbakery 0.7.6 depends on ttfautohint-py
    fontbakery 0.7.5 depends on ttfautohint-py
    fontbakery 0.7.4 depends on ttfautohint-py
    fontbakery 0.7.3 depends on ttfautohint-py
    fontbakery 0.7.2 depends on ttfautohint-py
    fontbakery 0.7.1 depends on ttfautohint-py
    fontbakery 0.7.0 depends on ttfautohint-py

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies
make: *** [venv/touchfile] Error 1

[eliheuer]

I just tried this on macOS 10.14.6 and the build instruction worked as expected with make build.

[simoncozens]

This is our old friend, the ttfautohint-on-M1 issue. I am working on it. We now have access to the macOS11 build environment for GitHub so should be able to generate universal binary wheels. See fonttools/ttfautohint-py#8