This is wrong, why would you remove the glewInit() call?! This will 100% break on a bunch, if not all platforms.

Has this been properly tested yet?
I'm afraid of switching to this embedded loader without being sure it still handles OpenGL 2.0 (ES) properly on raspberry pi boards

Alright, I'm gonna wait for this branch to be tested on other platforms before merging.
But before, a few things:

1. If glew is not longer needed, it should be removed from the core CMakeLists.txt
2. It's important to check if this change has any performance impact.

Code updated as follows:

1. Re-added an include required for linking properly in Windows which I removed by accident.
2. Removed all GLEW dependencies and updated readme.

Tested on Linux/amd64 & Windows/x64.
About the performance, I agree it should be tested in low-end devices. Dear ImGui update is mostly bugfixes, according to its changelog. Graphics access remains the same, the only difference is the way OpenGL is initialized.

Alright, i'll check that the ImGui update was done correctly, some settings had to be changed in imconfig for the last version

Looks like trying to get GL from pkg-config fails on MacOS, not really sure what the cleanest way to go about it is at this point.

Alright, I've done this along with other changes in the pull request I just merge.
Please confirm that the latest commit fixes the issues you were having and re-open if it doesn't