/var/tmp/portage/sci-astronomy/stellarium-0.16.0-r1/work/stellarium-0.16.0/src/core/StelLocationMgr.cpp: In constructor ‘LibGPSLookupHelper::LibGPSLookupHelper(QObject*)’: /var/tmp/portage/sci-astronomy/stellarium-0.16.0-r1/work/stellarium-0.16.0/src/core/StelLocationMgr.cpp:56:14: error: ‘class gpsmm’ has no member named ‘is_open’ if(gps_rec->is_open()) https://fossies.org/dox/gpsd-3.16/classgpsmm.html Without gps use flag stellarium does not fail. Can provide more information.
Thank you for the report. Please attach the logfiles https://wiki.gentoo.org/wiki/Bugzilla/Bug_report_guide#Problems_at_build_time and reopen this ticket (Status:unconfirmed).