Exactly one of NDEBUG and _DEBUG needs to be defined! [new to C++][Implementing SDK into project]

[MrMechanical]

I'm not sure if this is the right place to post this. I am struggling with this error in my custom C++ game engine's implementation's of Physx4.1 SDK. Do I Just define NDEBUG or am I doing something wrong? I apologize for my inexperience, I am very much a beginner when it comes to implementing libraries.

Thank you so much for the help, I am extremely grateful.

[AlesBorovicka]

Check your configuration pre-processor defines, there should be just one of the defines. In your project where you include physx headers, you should have one of those defines.

[Woking-34]

If you are using CMake try explicitly declaring your build type, like:
cmake .. -DCMAKE_BUILD_TYPE=Debug "-GUnix Makefiles"

[mattearly]

I had to add it to the Preprocessor Definitions in Visual Studio when in Release Mode. There may be a better way, but I could not find any other half-decent solution.