Create a build_config header file.

src/shared/platform/posix/nacl_host_desc.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Service Runtime.  I/O Descriptor / Handle abstraction.  Memory
  * mapping using descriptors.
  *
  * Note that we avoid using the thread-specific data / thread local
  * storage access to the "errno" variable, and instead use the raw
  * system call return interface of small negative numbers as errors.
  */
 
 #include <stdint.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/mman.h>
 #include <unistd.h>
+#include "native_client/src/include/nacl_defines.h"
 
 #if NACL_LINUX
 # include <pthread.h>
 /* pthread_once for NaClHostDescInit, which is no-op on other OSes */
 #endif
 
 #include "native_client/src/include/nacl_platform.h"
 #include "native_client/src/include/portability.h"
 
 #include "native_client/src/shared/platform/nacl_check.h"
@@ skipping 691 matching lines @@
     return -NaClXlateErrno(errno);
   return 0;
 }
 
 int NaClHostDescReadlink(const char *path, char *buf, size_t bufsize) {
   int retval = readlink(path, buf, bufsize);
   if (retval < 0)
     return -NaClXlateErrno(errno);
   return retval;
 }