Program received signal SIGSEGV, Segmentation fault. 0xb6100956 in glMatrixMode () from /usr/lib/mesa/libGL.so.1 (gdb) bt #0 0xb6100956 in glMatrixMode () from /usr/lib/mesa/libGL.so.1 #1 0xb28985f0 in setup_viewport (this=0x8518c30, xx=0, yy=20, ww=640, hh=440) at DLD-FUNCTIONS/fltk_backend.cc:136 #2 OpenGL_fltk::resize (this=0x8518c30, xx=0, yy=20, ww=640, hh=440) at DLD-FUNCTIONS/fltk_backend.cc:120 #3 0xb28941e8 in show_menubar (this=0x8532498, xfp=, hh=, ww=, yy=, xx=) at DLD-FUNCTIONS/fltk_backend.cc:765 #4 plot_window::plot_window (this=0x8532498, xfp=, hh=, ww=, yy=, xx=) at DLD-FUNCTIONS/fltk_backend.cc:728 #5 0xb2894a2c in do_new_window () at DLD-FUNCTIONS/fltk_backend.cc:1541 #6 new_window () at DLD-FUNCTIONS/fltk_backend.cc:1419 #7 __fltk_redraw__ () at DLD-FUNCTIONS/fltk_backend.cc:1735 #8 0xb28a305d in fltk_backend::redraw_figure (this=0x83afea8, go=...) at DLD-FUNCTIONS/fltk_backend.cc:1833 #9 0xb76520ed in redraw_figure (args=...) at graphics.h:1895 #10 Fdrawnow (args=...) at graphics.cc:6801 #11 0xb788b789 in octave_builtin::do_multi_index_op (this=0x80a8428, nargout=0, args=..., lvalue_list=0x0) at ov-builtin.cc:128 #12 0xb788bf8f in octave_builtin::do_multi_index_op (this=0x80a8428, nargout=0, args=...) at ov-builtin.cc:98 #13 0xb795748a in octave_value::do_multi_index_op (this=0xbfffcde8, nargout=0, idx=...) at ov.cc:1266 #14 0xb774d4f2 in feval (name=..., args=..., nargout=0) at oct-parse.yy:4133 #15 0xb76c2c83 in interactive_input (s=..., force_readline=false) at input.cc:237 #16 0xb76c3041 in octave_gets (buf=0x84b6928 "", max_size=8192) at input.cc:280 #17 get_user_input (buf=0x84b6928 "", max_size=8192) at input.cc:351 #18 octave_read (buf=0x84b6928 "", max_size=8192) at input.cc:373 #19 0xb76ca245 in yy_get_next_buffer () at lex.cc:3097 #20 0xb76d5c07 in octave_lex () at lex.cc:2939 #21 0xb7752e4d in octave_parse () at oct-parse.cc:2411 #22 0xb7822a2d in main_loop () at toplev.cc:567 #23 0xb77caefc in octave_main (argc=6, argv=0xbfffdb24, embedded=0) at octave.cc:933 #24 0x080487d3 in main (argc=6, argv=0xbfffdb24) at main.c:35