Manually add include path for header files. CMakeLists.txt don't work but cmake works fine.

Hi,

After some fiddling with SDL2 I have finally been able to compile an example using cmake and make under mingw32 with msys.
Unfortunately CLion does not sees sdl2 header files that are being loaded correctly by the cmake itself.

In my github repository there is forked and little tweeked version of FindSDL2.cmake https://github.com/tarach/sdl2-cmake-scripts

It works fine when used with commands:

mkdir build
cd build
cmake .. -G"MSYS Makefiles"
make

For CMakeLists.txt like the fallowing:

project(simple-timeline-recorder)
cmake_minimum_required(VERSION 3.2)
set(CMAKE_CXX_

#include <iostream>
#include <SDL.h>

int main(int, char**)
{
    if (SDL_Init(SDL_INIT_VIDEO) != 0)
    {
        std::cout << "SDL_Init Error: " << SDL_GetError() << std::endl;
        return 1;
    } else
    {
        std::cout << "OMG it finally works..." << std::endl;
    }

    SDL_Quit();

    return 0;
}

But CLion fails to load header files from it.

tarach@tarach-win7-pc-mingw build
cmake .. -G"MSYS Makefiles"
-- The C compiler identification is GNU 4.8.1
-- The CXX compiler identification is GNU 4.8.1
-- Check for working C compiler: D:/apps/MinGW/bin/gcc.exe
-- Check for working C compiler: D:/apps/MinGW/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: D:/apps/MinGW/bin/g++.exe
-- Check for working CXX compiler: D:/apps/MinGW/bin/g++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
<FindSDL2.cmake>
-- Looking for include file pthread.h
-- Looking for include file pthread.h - not found
-- Found Threads: TRUE
</FindSDL2.cmake>
-- Found SDL2: mingw32;D:/apps/SDL2/i686-w64-mingw32/lib/libSDL2main.a;d:/apps/MinGW_dev/bin/SDL2.dll
-- Configuring done
-- Generating done
-- Build files have been written to: D:/projects/simple-timeline-recorder/build
tarach@tarach-win7-pc-mingw build
make
Scanning dependencies of target simple-timeline-recorder
[100%] Building CXX object CMakeFiles/simple-timeline-recorder.dir/src/main.cpp.obj
Linking CXX executable simple-timeline-recorder.exe
[100%] Built target simple-timeline-recorder
tarach@tarach-win7-pc-mingw build
./simple-timeline-recorder.exe
OMG it finally works...