I’ve hit this compile error on macOS 10.15 with the file 
src/lib/ioloop-notify-kqueue.c:

> error: implicit declaration of function 'i_gettimeofday' is invalid in C99

The fix is to #include "time-util.h"

> --- ./src/lib/ioloop-notify-kqueue.c  2020-09-18 19:56:38.000000000 -0400
> +++ ./src/lib/ioloop-notify-kqueue.c  2020-09-18 20:54:36.000000000 -0400
> @@ -11,6 +11,7 @@
>  
>  #include "ioloop-private.h"
>  #include "llist.h"
> +#include "time-util.h"
>  #include <unistd.h>
>  #include <fcntl.h>
>  #include <sys/types.h>


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