Philip Withnall created an issue: #722
The GLib CI is failing on macos with
Objective-C compiler for the host machine: cc (clang 10.0.0)
Objective-C linker for the host machine: APPLE ld 409.12
WARNING: No include directory found parsing "cc -xobjc -E -v -" output
(Full log, but it doesn’t contain any more clues)