If octave-3.8.0 is installed with the new GUI and I run octave --force-gui it exits with signal 11 if it was not build with curl support, see http://savannah.gnu.org/bugs/?41067. So enabling the GUI (I think it is enabled using USE=opengl) should also require USE=curl. Reproducible: Always
Committed the patch from upstream, please rebuild with octave-3.8.0.ebuild revision: 1.4 or higher: Fix bug 501760 octave 3.8.0 gui crashes if curl is not available, by applying the patch from upstream for http://savannah.gnu.org/bugs/?41067. Thanks to Fabian Koester for reporting.