Question: Running demo on windows about microui HOT 2 OPEN

Use -i with your compiler to allow it to see the headers. these are .h are include/ .You will then need to link the library using -l which are under /lib I think. Things may take a while to understand but it will eventually make sense. Here is an example build command using the visual studio compiler.
cl demo\main.c demo\renderer.c -I SDL2-2.0.14\include -I src\ SDL2-2.0.14\lib\x64\SDL2.lib SDL2-2.0.14\lib\x64\SDL2main.lib opengl32.lib
Download A recent version of SDL2 here, SDL2-devel-* will be easier since you don't need to compile them. Post again if you get more specific errors, I have encountered some in the past.
https://github.com/libsdl-org/SDL/releases

from microui.

Add the folders for SDL to your include path and change the include to
#include "SDL.h"

Also if you use the Geometry API, you don't need to include OpenGL as in the example.

from microui.