Hence glyphsLib >= 6 (and in turn fontmake when using glyphsLib 6) are also incompatible with pypy3... See https://github.com/googlefonts/fontmake/pull/810#issuecomment-928036871 Upstream issue => https://github.com/fonttools/openstep-plist/issues/12
Hence glyphsLib >= 6 (and in turn fontmake when using glyphsLib 6) are also incompatible with pypy3...
See googlefonts/fontmake#810 (comment)
Upstream issue => fonttools/openstep-plist#12