Lighttpd

Building lighttpd 1.4.60 fails on macOS 10.13.6:

In file included from ck.c:26:
./ck.h:34:1: error: unknown type name 'errno_t'
errno_t ck_getenv_s (size_t * restrict len, char * restrict value, rsize_t maxsize, const char * restrict name);
^
./ck.h:38:1: error: unknown type name 'errno_t'
errno_t ck_memclear_s (void *s, rsize_t smax, rsize_t n);
^
./ck.h:42:15: error: unknown type name 'errno_t'
static inline errno_t ck_memzero(void *s, rsize_t n);
              ^
./ck.h:43:15: error: unknown type name 'errno_t'
static inline errno_t ck_memzero(void *s, rsize_t n) {
              ^
./ck.h:47:1: error: unknown type name 'errno_t'
errno_t ck_strerror_s (char *s, rsize_t maxsize, errno_t errnum);
^
./ck.h:47:50: error: unknown type name 'errno_t'
errno_t ck_strerror_s (char *s, rsize_t maxsize, errno_t errnum);
                                                 ^
6 errors generated.
make[3]: *** [ck.o] Error 1