It seems relevant to all BSD systems.
In xcode the option -Wno-error-implicit-function-declaration is enabled. So the following error occured:
Idris2/support/c/idris_file.c:76:13: Missing '#include <sys/time.h>'; declaration of 'select' must be imported from module 'Darwin.POSIX.sys.time' before it is required
I hope it won't break anything on linux.