$ gcc test2.c -o test2 -L /usr/local/lib/ -lGL -lGLU -lglut && gdb ./test2
GNU gdb (GDB) 7.5-ubuntu
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/lars/comcard/fxruby/opengl/opengl/test2...(no debugging symbols found)...done.
(gdb) run
Starting program: /home/lars/comcard/fxruby/opengl/opengl/test2
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff3199700 (LWP 9545)]

Program received signal SIGSEGV, Segmentation fault.
_mesa_expand_bitmap (width=width@entry=8, height=height@entry=8, unpack=unpack@entry=0x655b68, bitmap=bitmap@entry=0x0, destBuffer=<optimized out>,
    destStride=destStride@entry=512, onValue=onValue@entry=0 '\000') at ../../src/mesa/main/image.c:428
428                 if (*src & mask) {
(gdb) bt
#0  _mesa_expand_bitmap (width=width@entry=8, height=height@entry=8, unpack=unpack@entry=0x655b68, bitmap=bitmap@entry=0x0, destBuffer=<optimized out>,
    destStride=destStride@entry=512, onValue=onValue@entry=0 '\000') at ../../src/mesa/main/image.c:428
#1  0x00007ffff4020176 in unpack_bitmap (destStride=512, destBuffer=<optimized out>, bitmap=0x0, unpack=0x655b68, height=8, width=8, py=<optimized out>, px=<optimized out>,
    st=<optimized out>) at ../../src/mesa/state_tracker/st_cb_bitmap.c:273
#2  accum_bitmap (bitmap=0x0, unpack=0x655b68, height=8, width=8, y=0, x=0, st=<optimized out>) at ../../src/mesa/state_tracker/st_cb_bitmap.c:732
#3  st_Bitmap (ctx=<optimized out>, x=0, y=0, width=8, height=8, unpack=0x655b68, bitmap=0x0) at ../../src/mesa/state_tracker/st_cb_bitmap.c:767
#4  0x00007ffff3f554d5 in _mesa_Bitmap (width=8, height=8, xorig=<optimized out>, yorig=<optimized out>, xmove=<optimized out>, ymove=<optimized out>, bitmap=0x0)
    at ../../src/mesa/main/drawpix.c:347
#5  0x0000000000400bbd in init ()
#6  0x0000000000400c6f in main ()
(gdb) quit