Fetchmail's fetchmail conf does not work on Gentoo

[Superfly Johnson]

Hi again Guix-Devel mailing list. I'm currently trying to configure a 
fetchmail daemon on my gentoo laptop to get mails. Unfortunately, 
fetchmailconf will not execute properly. It will always return line 2: 
exec: :: not found.

I have looked at the file it is trying to execute. The entire script is
#!/gnu/store/3jhfhxdf6v5ms10x5zmnl166dh3yhbr1-bash-minimal-5.1.16/bin/sh
exec : /fetchmailconf.py "$@"

It seems to me like the path to fetchmailconf needs to be corrected.