[root]# guix environment perl -- perl --version
accepted connection from pid 1896, user root
guix environment: error: execlp: No such file or directory
[root]# guix environment perl
accepted connection from pid 1956, user root
sh-4.2# which perl
which: no perl in (/gnu/store/jywkphwvv38x53vpcmnjzvwg3qqa0qi8-profile/bin:/gnu/store/jywkphwvv38x53vpcmnjzvwg3qqa0qi8-profile/sbin:~root/.guix-profile/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin)