Could not find module build/webview on OS X

[microspino]

I'm using Mojave 10.14.6.
I've tried to jpm test eihter with janet 1.15.3 and HEAD (both installed via homebrew).
I get this:

jpm test
running test/test.janet ...
could not find module build/webview:
    /usr/local/Cellar/janet/HEAD-c909762/lib/janet/build/webview.jimage
    /usr/local/Cellar/janet/HEAD-c909762/lib/janet/build/webview.janet
    /usr/local/Cellar/janet/HEAD-c909762/lib/janet/build/webview/init.janet
    /usr/local/Cellar/janet/HEAD-c909762/lib/janet/build/webview.so
  in require-1 [boot.janet] on line 2528, column 20
  in import* [boot.janet] on line 2567, column 15
  in _thunk [test/test.janet] (tailcall) on line 3, column 1