Linux: 'libffnvcodec-dev' was dropped from Ubuntu noble — the NVDEC headers are distribution-free, so install them from source (nv-codec-headers git) like the Fedora branch already did; the appimage step and install-deps.sh no longer apt-install the package. Windows: ocio-sys is the GIT fork (pinned in the root manifest), so the old crate-unpack + build.rs glob patch (registry/cache's ocio-sys-0.2.1.crate) can never match — git dependencies don't ship a .crate archive and unpack under registry/src/git/<hash>, hence the "ls .../ocio-sys-0.2.1/build.rs: No such file" failure. The fork's build.rs already carries the GNU-toolchain fix; the unpack/glob/sed step is removed.