Hello,

1. What version of Go are you using (go version)?
   I'm using Go version 1.6.2 and Gomobile version +c435d0b
2. What operating system and processor architecture are you using (go env)?
   I'm on MacOS (darwin / amd64)
3. What did you do?
   I'm trying to use the Default system font on MacOS and iOS (gomobile).
   The complete program can be found here: https://github.com/antoine-richard/gomobile-text
   See this line: https://github.com/antoine-richard/gomobile-text/blob/master/game.go#L47
4. What did you expect to see?
   I expect to see the Default font being used.
5. What did you see instead?
   I'm getting the following error: freetype: invalid TrueType format: bad maxp length: 6 on both MacOS and iOS when using the Default font.
   The monospace font works on these OSes.
   The default font works on Android.

I've found 2 issues mentioning the same kind of problem: #10644 and #10136

Also the test on default font fails on MacOS:

--- FAIL: TestLoadFonts (0.02s)
    font_test.go:41: default font: not a TTF: missing "glyf" table
FAIL
exit status 1
FAIL    golang.org/x/mobile/exp/font    0.035s

Is there a way to use the default font on Darwin?
Is there any known workaround?

Thank you
Antoine