Our rav1e package ((gnu packages video) rav1e) is at version 0.3.5.

I noticed that FFmpeg 4.4 requires rav1e 0.4.0, at minimum, so I tried
updating it.

Luckily, there is a similar / duplicate package ((gnu packages
crates-graphics) rust-rav1e-0.4.0), so the required versions of Rust
dependencies are already available. The differenc between these packages
is that the 'rav1e' package includes a C interface, which is how FFmpeg
uses it.

I applied the attached patch and tried to build the package, but it
fails like this:

------
     Running `rustc --crate-name rav1e --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -Cembed-bitcode=no -C debuginfo=2 --crate-type staticlib --crate-type cdylib --cfg cargo_c -C link-arg=-Wl,-soname,librav1e.so.0 --cfg 'feature="asm"' --cfg 'feature="av-metrics"' --cfg 'feature="binaries"' --cfg 'feature="cc"' --cfg 'feature="clap"' --cfg 'feature="console"' --cfg 'feature="default"' --cfg 'feature="fern"' --cfg 'feature="ivf"' --cfg 'feature="nasm-rs"' --cfg 'feature="regex"' --cfg 'feature="scan_fmt"' --cfg 'feature="signal-hook"' --cfg 'feature="signal_support"' --cfg 'feature="y4m"' -C metadata=8c83b2dd27bd5884 -C extra-filename=-8c83b2dd27bd5884 --out-dir /tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps -C incremental=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/incremental -L dependency=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps --extern arg_enum_proc_macro=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libarg_enum_proc_macro-93ed8c9ea7d5dd1b.so --extern arrayvec=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libarrayvec-0d176be780e9b8b6.rmeta --extern av_metrics=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libav_metrics-81dbb1d256cbbf07.rmeta --extern bitstream_io=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libbitstream_io-788d0621a761068a.rmeta --extern cfg_if=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libcfg_if-8f2b5f8438981483.rmeta --extern clap=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libclap-d86faf89dbe50a9a.rmeta --extern console=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libconsole-37992ef17e817539.rmeta --extern fern=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libfern-934bc2d1ada6dcee.rmeta --extern itertools=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libitertools-495c21300f2b2e41.rmeta --extern ivf=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libivf-d91769e0921d0961.rmeta --extern libc=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liblibc-c2941137f88810f2.rmeta --extern log=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liblog-1a0cffccf240c183.rmeta --extern noop_proc_macro=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnoop_proc_macro-d0c6cf2e2e4ea6d3.so --extern num_derive=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnum_derive-f0f3c044a3428786.so --extern num_traits=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnum_traits-e0a0117e0cd33ee6.rmeta --extern paste=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libpaste-dc838f84405bb32b.so --extern rayon=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/librayon-c933e3b6685ed4e0.rmeta --extern rust_hawktracer=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/librust_hawktracer-44830043894e2e85.rmeta --extern scan_fmt=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libscan_fmt-708ebb99bb6cce93.rmeta --extern signal_hook=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libsignal_hook-aa978f9596e44d5a.rmeta --extern simd_helpers=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libsimd_helpers-8a19edc7c2ce4cfb.so --extern thiserror=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libthiserror-d53d38f341785296.rmeta --extern v_frame=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libv_frame-d2c737d079b3471b.rmeta --extern y4m=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liby4m-afa86606376e5621.rmeta --cap-lints allow -L /tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/build/rav1e-528ae66f4a5e7c6e/out --cfg nasm_x86_64 -l static=rav1easm`
error: crate `log` required to be available in rlib format, but was not found in this form

error: crate `libc` required to be available in rlib format, but was not found in this form

error: crate `num_traits` required to be available in rlib format, but was not found in this form

error: crate `rust_hawktracer` required to be available in rlib format, but was not found in this form

error: crate `bitstream_io` required to be available in rlib format, but was not found in this form

error: crate `arrayvec` required to be available in rlib format, but was not found in this form

error: crate `itertools` required to be available in rlib format, but was not found in this form

error: crate `v_frame` required to be available in rlib format, but was not found in this form

error: crate `thiserror` required to be available in rlib format, but was not found in this form

error: crate `rayon` required to be available in rlib format, but was not found in this form

error: aborting due to 10 previous errors

error: could not compile `rav1e`.

Caused by:
  process didn't exit successfully: `rustc --crate-name rav1e --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -Cembed-bitcode=no -C debuginfo=2 --crate-type staticlib --crate-type cdylib --cfg cargo_c -C link-arg=-Wl,-soname,librav1e.so.0 --cfg 'feature="asm"' --cfg 'feature="av-metrics"' --cfg 'feature="binaries"' --cfg 'feature="cc"' --cfg 'feature="clap"' --cfg 'feature="console"' --cfg 'feature="default"' --cfg 'feature="fern"' --cfg 'feature="ivf"' --cfg 'feature="nasm-rs"' --cfg 'feature="regex"' --cfg 'feature="scan_fmt"' --cfg 'feature="signal-hook"' --cfg 'feature="signal_support"' --cfg 'feature="y4m"' -C metadata=8c83b2dd27bd5884 -C extra-filename=-8c83b2dd27bd5884 --out-dir /tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps -C incremental=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/incremental -L dependency=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps --extern arg_enum_proc_macro=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libarg_enum_proc_macro-93ed8c9ea7d5dd1b.so --extern arrayvec=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libarrayvec-0d176be780e9b8b6.rmeta --extern av_metrics=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libav_metrics-81dbb1d256cbbf07.rmeta --extern bitstream_io=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libbitstream_io-788d0621a761068a.rmeta --extern cfg_if=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libcfg_if-8f2b5f8438981483.rmeta --extern clap=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libclap-d86faf89dbe50a9a.rmeta --extern console=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libconsole-37992ef17e817539.rmeta --extern fern=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libfern-934bc2d1ada6dcee.rmeta --extern itertools=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libitertools-495c21300f2b2e41.rmeta --extern ivf=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libivf-d91769e0921d0961.rmeta --extern libc=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liblibc-c2941137f88810f2.rmeta --extern log=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liblog-1a0cffccf240c183.rmeta --extern noop_proc_macro=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnoop_proc_macro-d0c6cf2e2e4ea6d3.so --extern num_derive=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnum_derive-f0f3c044a3428786.so --extern num_traits=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libnum_traits-e0a0117e0cd33ee6.rmeta --extern paste=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libpaste-dc838f84405bb32b.so --extern rayon=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/librayon-c933e3b6685ed4e0.rmeta --extern rust_hawktracer=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/librust_hawktracer-44830043894e2e85.rmeta --extern scan_fmt=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libscan_fmt-708ebb99bb6cce93.rmeta --extern signal_hook=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libsignal_hook-aa978f9596e44d5a.rmeta --extern simd_helpers=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libsimd_helpers-8a19edc7c2ce4cfb.so --extern thiserror=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libthiserror-d53d38f341785296.rmeta --extern v_frame=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/libv_frame-d2c737d079b3471b.rmeta --extern y4m=/tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/deps/liby4m-afa86606376e5621.rmeta --cap-lints allow -L /tmp/guix-build-rav1e-0.4.0.drv-0/rav1e-0.4.0/target/release/build/rav1e-528ae66f4a5e7c6e/out --cfg nasm_x86_64 -l static=rav1easm` (exit code: 1)
Error: Kind(InvalidInput)
command "cargo" "cinstall" "--release" "--prefix=/gnu/store/hfs14fqji8x4b0dpl910ymqchq6182ym-rav1e-0.4.0" failed with status 1
------

Does anyone know what to do? I'm totally out of my depth.