use_guix() {
  if [ -f channels.scm ]
  then
    log_status "Using Guix version from channels.scm"
    export GUIX_ENVIRONMENT=$(guix time-machine -C channels.scm -- environment "$@" -- bash -c 'echo $GUIX_ENVIRONMENT')
    eval "$(guix time-machine -C channels.scm -- environment "$@" --search-paths)"
  else
    export GUIX_ENVIRONMENT=$(guix environment "$@" -- bash -c 'echo $GUIX_ENVIRONMENT')
    eval "$(guix environment "$@" --search-paths)"
  fi
}