hello Guix

Guix on foreign distribution:

$ guix install curseradio
$ curseradio

  File "/gnu/store/608bvypsh90c58apvd2cgg3m9l2pwjqn-python-3.7.4/lib/python3.7/subprocess.py", line 1522, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/bin/mpv': '/usr/bin/mpv'

I've created link to mpv in /gnu/store in /usr/bin, it works now. but this fix is not Guix wayish.

how to fix it correctly in music.scm?
to patch curseradio.py: /usr/bin/mpv -> .guix-profile/bin/mpv in curseradio.py in music.scm with modify-phases?