pip install enable fails on Python 3.8 / macOS Ventura

[mdickinson]

A pip install enable into a freshly-created Python 3.8 venv is failing at compilation time for me on macOS Ventura (13.2.1).
I'll attach a full transcript to this issue, but the key part of the error seems to be this:

      In file included from kiva/agg/freetype2/src/base/ftbase.c:38:
      kiva/agg/freetype2/src/base/ftmac.c:150:11: error: implicit declaration of function 'ATSFontGetFileReference' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
          err = ATSFontGetFileReference( ats_font_id, ats_font_ref );
                ^
      kiva/agg/freetype2/src/base/ftmac.c:150:11: note: did you mean 'FT_ATSFontGetFileReference'?
      kiva/agg/freetype2/src/base/ftmac.c:142:3: note: 'FT_ATSFontGetFileReference' declared here
        FT_ATSFontGetFileReference( ATSFontRef  ats_font_id,
        ^
      kiva/agg/freetype2/src/base/ftmac.c:186:19: error: 'ATSFontFindFromName' is unavailable
          ats_font_id = ATSFontFindFromName( cf_fontName,
                        ^
      /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/ATSFont.h:811:1: note: 'ATSFontFindFromName' has been explicitly marked unavailable here
      ATSFontFindFromName(
      ^

[mdickinson]

Here's the full install log

enable-install-log.txt

[mdickinson]

This looks related: https://gitlab.freedesktop.org/freetype/freetype/-/issues/448

[mdickinson]

Looks like this is largely a duplicate of #1006