> while executing ['/nix/store/8kf8f5bfyfb7j33pzl3whnxdmnqpvm1a-bash-5.3p3/bin/bash', '-euo', 'pipefail', '-c', '\n        /nix/store/a8qf8fapk2k3b5v26fic1h5h6h88vjhq-python3-3.13.9/bin/python3 ../generate-deps.py ../ > manual.d\n        /nix/store/a8qf8fapk2k3b5v26fic1h5h6h88vjhq-python3-3.13.9/bin/python3 ../substitute.py summary /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build < ..//source/SUMMARY.md.in > /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/source/SUMMARY.md\n        sed -e \'s|@version@|2.31.2|g\' < ../book.toml.in > /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/book.toml\n        /nix/store/fn86fjsd6891lspd23bm5263dcfwly5z-rsync-3.4.1/bin/rsync -r --include=\'*.md\' ..// /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/\n        (cd /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build; RUST_LOG=warn /nix/store/vf3ivh12nbndw5r0lz53clfmmbdngjd7-mdbook-0.5.0/bin/mdbook build -d /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build 3>&2 2>&1 1>&3) | { grep -Fv "because fragment resolution isn\'t implemented" || :; } 3>&2 2>&1 1>&3\n        rm -rf /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/manual\n        mv /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/html /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/manual\n        find /private/tmp/nix-build-nix-manual-2.31.2.drv-0/source/doc/manual/build/manual -iname meson.build -delete\n    ']
       > --- stdout ---
       > skipping non-regular file ".version"
       >
       > --- stderr ---
       > ERROR invalid key `substitute-search`
       >
       > ninja: build stopped: subcommand failed.
       For full logs, run 'nix log /nix/store/fd3kqhv3sd8avhb71qidhk0mzfi1qrnz-nix-manual-2.31.2.drv'.
error: 1 dependencies of derivation '/nix/store/k35ri1zavds0ic5904i4g7vi80z0i384-nix-2.31.2.drv' failed to build