I was getting many issues with the daniels's ebuild.
Then, I updated that ebuild to 0.3.1 version of mugshot and everything is running smooth.
Here it is what I did:
# mkdir -v /var/lib/layman/jkosta
add the line "/var/lib/layman/jkosta" to file /var/lib/layman/make.conf
(without the quotation ...