Purpose - to make the build of this project easy on any Linux platform. In my case I wanted to build it as well for aarch64, Manjaro Linux for my Raspberry Pi 4 B.

Problem - all the dependencies, it was not clear what you really need, what you don't, and yes - my CMakeLists is still dirty. I had to read approx 15 pages / "libs How Tos" / etc to understand what exactly and only to include in my simple CMakeLists.txt, how do I get and install it. Building several of the libraries by myself helped partially... So as I'm total newbie with IMGUI I want to spare for you the additional efforts I had :).

Prerequisites - to have installed GCC and Cmake, potentially whatever development packages you need and work with.

For the imgui demo: First install these packages:

• sudo apt-get install xorg-dev
• sudo apt-get install libglfw3-dev
• sudo apt-get install libglu1-mesa-dev
• sudo apt-get install freeglut3-dev

Then download from github the glfw, I use the Tag 3.3.2 from here: https://github.com/glfw/glfw/releases/tag/3.3.2

• unzip, run in terminal in the root directory:
• $ cmake .
• $ make
• $ sudo make install

Finally you have to build the simple "glad" library provided in this package. From terminal navigate to "imgui_aarch64_glfw_openGL2_experiment/glad/". There run

• $ cmake .
• $ make

Now navigate to "imgui_aarch64_glfw_openGL2_experiment/imgui/examples/example_glfw_opengl2/". Again call "cmake ." and "make".

Change the permissions of the resulting file e.g. with $ chmod u+x example_glfw_opengl2_cmake

Execute with $ ./example_glfw_opengl2_cmake

To run in background, releasing the console add an & at the end like this: $ ./example_glfw_opengl2_cmake&

I have tested it on 3 platforms:

• one Ubuntu;
• on a Linux Mint;
• built and executed it on the Raspberry Pi 4 B with Manjaro Linux

I hope you will enjoy this one :).

Now you have some basics to start with RPI4 linux based gui applications.