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FAQ: Update OpenGL FAQs to mention the modern libgl-devel package instead of CDTs #64

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FAQ: Update OpenGL FAQs to mention the modern libgl-devel package instead of CDTs #64

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14 changes: 11 additions & 3 deletions docs/FAQ.md
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Expand Up @@ -52,9 +52,17 @@ If you still encounter issues, you will also need to set `cmake_minimum_required

### What to do if my conda environment C++ compiler is unable to find GL/gl.h?

For OpenGL and related packages, conda-forge relies on the system version for loading libraries at run-time. But when compiling C/C++ code that includes those headers, it expects the cdt packages to be installed.
If you are using Windows or macOS, you do not need any additional package to find `GL/gl.h` and use `OpenGL`.

Instead for using `OpenGL` on Linux, conda-forge packages the [`libglvnd`](https://gitlab.freedesktop.org/glvnd/libglvnd) OpenGL loader that contains the library required to link OpenGL, and you can install it with:

On an x86-64 Linux platform you can install these with:
~~~
mamba install -c conda-forge mesa-libgl-devel-cos7-x86_64 mesa-dri-drivers-cos7-x86_64 libselinux-cos7-x86_64 libxxf86vm-cos7-x86_64
mamba install -c conda-forge libgl-devel
~~~

For actually running OpenGL-applications on Linux, you also need to make sure that your distribution has installed the packages containing the OpenGL drivers for you GPU.
In most cases those should be already installed in your system, but in case they are not (tipically for headless systems or barebone containers) you can tipically add them with:

- Debian/Ubuntu-based distributions: `sudo apt-get install libgl1-mesa-dri libglx-mesa0 libegl-mesa0`
- Fedora-based distributions: `sudo dnf install mesa-libGL mesa-libEGL mesa-dri-drivers`

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