Thanks for pointing this out. There was a missing Depends, and I just pushed mrbuild=1.9-2 to fix that. Works for me in sbuild now.
- Bug#1067349: gl-image-display: FTBFS: Fl_Gl_Ima... Lucas Nussbaum
- Bug#1067349: marked as done (gl-image-disp... Debian Bug Tracking System
- Bug#1067349: closed by Dima Kogan <dko.... Andrey Rakhmatullin
- Bug#1067349: closed by Dima Kogan <... Dima Kogan
