Irrlicht Engine

I try to compile the helloWorld on Mac OS 10.11 using Xcode Version 8.0, but getting this error: Undefined symbols for architecture x86_64: "irr::CIrrDeviceMacOSX::CIrrDeviceMacOSX(irr::SIrrlichtCreationParameters const&)", referenced from: _createDeviceEx in libIrrlicht.a(Irrlicht.o) ...

What should i do transplant Irrlicht engine on the iPhone (iOS)? please give me some help. i follow the address "https://sourceforge.net/p/irrlicht/code/HEAD/tree/branches/ogl-es/" ,then genetate static library, but its too big. I do not how to deal with this matter ?it achieve at 120MB. i...

now, I find the "_IRR_OSX_PLATFORM_", so i think it can not relate to this matter, in olg-es, i choose the project name "lrrlicht_OSX", then i build it, generate a static library for My Mac,but when i run helloworld, it crash this problem, i do not how to deal with it.

thanks , I do not know what it is about "_IRR_OSX_PLATFORM_", Can you give me some detail step to build for my Mac.? please

i download the source code from branch-olg-es,then i use xcode8 build lrrlicht to generate a static library for my Mac(OSX 10.11), I open it's example and run helloWorld ,there happend crash. i do not know what is the matter about it, since i build for my iPhone ,run helloWorld-ios correctly. issues...