The Guix installation of Blender has no denoiser.
Blender's compositor says that Blender is compiled without 
"OpenImageDenoise"

Last time I checked OIDN (OpenImageDenoise) is free software and 
all it's dependancies are also.
I tried to packaged OIDN but it just ended up being a massive pain 
and It's depenadancy (ispc) just refused to compile.
Can you suggest some sort of solution (The IRC has no answers)