Older build environments don't know uint and ulong:
src/radio_base.c: In function 'radio_base_submit_request':
src/radio_base.c:527:9: error: unknown type name 'uint'
const uint timeout = radio_base_timeout_ms(self, req);
^
src/radio_request.c: In function 'radio_request_set_timeout':
src/radio_request.c:276:13: error: unknown type name 'uint'
const uint timeout = radio_base_timeout_ms(base, req);
^
unit_instance.c: In function 'test_connected':
unit_instance.c:425:5: error: unknown type name 'ulong'
ulong id[4];
^
b6021807dd