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 :).

update - cmake evolution, new toolchains for cmake and meson for dependencies only one CMakeList.txt in the example subdirectory builds all now including imgui and glad static libraries. to build youself create and navigate to a build directory. to compile for the native processor architecture:

• $ cmake /whatever/imgui_aarch64_glfw_openGL2_experiment/imgui/examples/example_glfw_opengl2
• $ make
• $ make install
• $ rm -fvR ../this-directory this is important if building a package with bitbaker.

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.