Compiling facetimehd on CachyOS (seems to be about kernel versions 6.13+)

[krzyczak]

For everyone trying to install this on CachyOS:

I tried compiling this on CachyOS (which is based on Arch) https://cachyos.org and I run into some issues, however I managed to get it working.

Here is what I did:

1. CachyOS kernel is compiled with clang instead of gcc, so first thing to note is that make needed to be run like this:

make CC=clang CXX=clang++ LD=ld.lld

2. CachyOS headers do not include <linux/prandom.h> in the <linux/random.h> header (as opposed to the headers found in linux-headers package, and so there was some invalid type error. Tio fix this I just added

#include <linux/prandom.h>

in the https://github.com/patjak/facetimehd/blob/master/fthd_ddr.c on line 19.

This way everything went well and the camera is working correctly.

I could create a PR for this but I am not quite sure how to autodetect that clang should be used and how and where set the CC=clang CXX=clang++ LD=ld.lld vars so that they don't need to be typed manually.

Any suggestions?

[nicahokie]

As you say I think point 1 might just be specific to CachyOS

but I think your point 2 is necessary for other distros on kernel 6.13+, but was not for kernel 6.12.x
In my case I am on Xanmod kernel 6.13 on ubuntu 24.10 and it helped me