This is currently very broken but this is what I had:
It is requires a package called ISPC.
(define-module (oidn)
#:use-module (guix packages)
;; #:use-module (gnu packages base)
#:use-module (gnu packages gcc)
#:use-module (gnu packages python)
#:use-module (gnu packages tbb)
#:use-module (gnu packages cmake)
#:use-module (guix git-download)
#:use-module (guix build-system cmake)
#:use-module ((guix licenses) #:prefix license:))
(define-public oidn
(package
(name "oidn")
(version "1.4.3")
(source
(origin
(method git-fetch)
(uri (git-reference
(url "https://github.com/OpenImageDenoise/oidn.git";)
(commit (string-append "v" version))))
(file-name (git-file-name name version))
(sha256
(base32
"14zga8xd7pxwhp50n36n0c8j12vdn92i90wf6nz868nlqvlpyakk"))))
(build-system cmake-build-system)
(inputs
(list cmake gcc python tbb)) ; for scripts/MakeHeader.py
(home-page "https://www.openimagedenoise.org/";)
(synopsis "A denoiser")
(description
"open source library of high-performance, high-quality
denoising filters for images rendered with ray tracing.")
(license license:asl2.0)))
