Tests fail to build: fatal error: 'TaskScheduler_c.h' file not found

[yurivict]

/usr/ports/misc/box2d/work/box2d-3.1.1/test/test_determinism.c:4:10: fatal error: 'TaskScheduler_c.h' file not found
    4 | #include "TaskScheduler_c.h"
      |          ^~~~~~~~~~~~~~~~~~~
1 error generated.

Version: 3.1.1
FreeBSD 15 STABLE

[erincatto]

This is used to build unit tests. It it brought in via CMake FetchContent.