treadstone-json-validate.cc:50:23: error: use of undeclared identifier 'getline'
ssize_t amt = getline(&line, &line_sz, stdin);

needs _WITH_GETLINE defined (see: man getline)

// C

define _WITH_GETLINE

include <assert.h>

include <stdio.h>

include <stdlib.h>

include <string.h>