Unknown type name 'uint8_t'?

Suddenly, my Xcode project is complaining about unknown type name ‘uint8_t’ in resource.h
Can anyone see what is happening?

In file included from /Users/jtsm/Desktop/Calendar/Calendar/proj.ios_mac/../Classes/Prefix.pch:11:
In file included from /Applications/Cocos/Cocos2d-x/cocos2d-x-3.10/cocos/cocos2d.h:41:
In file included from /Applications/Cocos/Cocos2d-x/cocos2d-x-3.10/cocos/base/CCAsyncTaskPool.h:28:
In file included from /Applications/Cocos/Cocos2d-x/cocos2d-x-3.10/cocos/platform/CCPlatformMacros.h:34:
In file included from /Applications/Cocos/Cocos2d-x/cocos2d-x-3.10/cocos/platform/CCPlatformDefine.h:35:
In file included from /Applications/Cocos/Cocos2d-x/cocos2d-x-3.10/cocos/platform/ios/CCPlatformDefine-ios.h:31:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/assert.h:44:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/stdlib.h:65:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/wait.h:110:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:195:2: error: unknown type name 'uint8_t'
        uint8_t  ri_uuid[16];
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:196:2: error: unknown type name 'uint64_t'
        uint64_t ri_user_time;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:197:2: error: unknown type name 'uint64_t'
        uint64_t ri_system_time;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:198:2: error: unknown type name 'uint64_t'
        uint64_t ri_pkg_idle_wkups;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:199:2: error: unknown type name 'uint64_t'
        uint64_t ri_interrupt_wkups;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:200:2: error: unknown type name 'uint64_t'
        uint64_t ri_pageins;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:201:2: error: unknown type name 'uint64_t'
        uint64_t ri_wired_size;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:202:2: error: unknown type name 'uint64_t'
        uint64_t ri_resident_size;      
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:203:2: error: unknown type name 'uint64_t'
        uint64_t ri_phys_footprint;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:204:2: error: unknown type name 'uint64_t'
        uint64_t ri_proc_start_abstime;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:205:2: error: unknown type name 'uint64_t'
        uint64_t ri_proc_exit_abstime;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:209:2: error: unknown type name 'uint8_t'
        uint8_t  ri_uuid[16];
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:210:2: error: unknown type name 'uint64_t'
        uint64_t ri_user_time;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:211:2: error: unknown type name 'uint64_t'
        uint64_t ri_system_time;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:212:2: error: unknown type name 'uint64_t'
        uint64_t ri_pkg_idle_wkups;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:213:2: error: unknown type name 'uint64_t'
        uint64_t ri_interrupt_wkups;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:214:2: error: unknown type name 'uint64_t'
        uint64_t ri_pageins;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:215:2: error: unknown type name 'uint64_t'
        uint64_t ri_wired_size;
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/sys/resource.h:216:2: error: unknown type name 'uint64_t'
        uint64_t ri_resident_size;      
        ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.

Update 1: I tried cocos new ... and it works, so it must be something in my project.

Update 2: I took the cocos new project from above and added all my classes, resources, etc and I get the same issue. It has to be something I have included.

I made a new project and copied piece by piece and it is working now. but I have no idea why.

strange… make sure to have included

#include <cstdint>

http://www.cplusplus.com/reference/cstdint/