It seems that there are some issues when running crystal play. I will include a screenshot. In short, it gives some ld problems. This might be a gcc issue?
Please collect first a full set of data for a bug ticket and then open the ticket. This ticket lacks all important information. https://wiki.gentoo.org/wiki/Bugzilla/Bug_report_guide I have had very good experience on the gentoo IRC [1] with questions like this. Of course there are also forums and mailing lists [2,3]. I hope you understand, that I will close the bug here therefore and wish you good luck on one of the mentioned channels [4]. Please create a new ticket. [1] https://www.gentoo.org/get-involved/irc-channels/ [2] https://forums.gentoo.org/ [3] https://www.gentoo.org/get-involved/mailing-lists/all-lists.html [4] https://www.gentoo.org/support/