在macos 10.11.6 ，xcode 8命令行编译ACE库，打印出
/Users/admin/AllExam/ACE_wrappers/ace/os_include/sys/os_types.h:52:16: error:
typedef redefinition with different types ('int' vs 'enum clockid_t')
typedef int clockid_t;
^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/time.h:171:3: note:
previous definition is here
} clockid_t;
导致编译失败，大神解救水深火热，不胜感激！