Command line output:
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
no code for module (guix build-system pyproject)
Computing Guix derivation for 'x86_64-linux'... \
The following derivation will be built:
   /gnu/store/yzqlyj6wgi460zm260gv3hd89af8iy3z-profile.drv
The following profile hook will be built:
   /gnu/store/qsaxbccd5cqqhq25mwpl7s785vfl3crw-guix-package-cache.drv
building package cache...
/builder for `/gnu/store/qsaxbccd5cqqhq25mwpl7s785vfl3crw-guix-package-cache.drv' failed to produce output path `/gnu/store/7y9jwqjwziav2c5rxsd8g9q4hij23w9n-guix-package-cache'
build of /gnu/store/qsaxbccd5cqqhq25mwpl7s785vfl3crw-guix-package-cache.drv failed
View build log at '/var/log/guix/drvs/qs/axbccd5cqqhq25mwpl7s785vfl3crw-guix-package-cache.drv.bz2'.
cannot build derivation `/gnu/store/yzqlyj6wgi460zm260gv3hd89af8iy3z-profile.drv': 1 dependencies couldn't be built
guix time-machine: error: build of `/gnu/store/yzqlyj6wgi460zm260gv3hd89af8iy3z-profile.drv' failed

build log:
(repl-version 0 1 1)
Generating package cache for '/gnu/store/qxjsjhv2qc0bgmb039cwxl9k2963fy77-profile'...
(exception unbound-variable (value #f) (value "Unbound variable: ~S") (value (nghttp2-1.41)) (value #f))