here's the gdb output with backtrace (i have no idea what all this means):

Tracing Options
  Quality:  9
  Bounding boxes.......On   Bounding threshold: 3
  Light Buffer.........On
  Vista Buffer.........On   Draw Vista Buffer....Off
  Antialiasing.........Off
  Clock value:    0.000  (Animation off)

  0:00:02 Parsing 330K tokens
  0:00:02 Creating bounding slabs
  0:00:02 Creating vista buffer
  0:00:02 Creating light buffers 333K tokens
Scene Statistics
  Finite objects:          292
  Infinite objects:          0
  Light sources:             2
  Total:                   294

  0:00:00 Displaying
  0:00:00 Rendering line 1 of 240
Program received signal SIGSEGV, Segmentation fault.
0x184f5c4 in pov::Diffuse_One_Light (Light_Source=0x1a03c28,
Light_Index=0,
    REye=0x7fffe0b0, Finish=0x1a05128, IPoint=0x7fffe360, Eye=0x1968b48,
    Layer_Normal=0x7fffdf70, Layer_Pigment_Colour=0x7fffdfd0,
    Colour=0x7fffe050, Attenuation=1, Object=0xbfc7f719) at
lighting.cpp:2365
2365        if (!(Test_Flag(Object, DOUBLE_ILLUMINATE_FLAG)))

(gdb) backtrace
#0  0x184f5c4 in pov::Diffuse_One_Light (Light_Source=0x1a03c28,
    Light_Index=0, REye=0x7fffe0b0, Finish=0x1a05128, IPoint=0x7fffe360,
    Eye=0x1968b48, Layer_Normal=0x7fffdf70,
Layer_Pigment_Colour=0x7fffdfd0,
    Colour=0x7fffe050, Attenuation=1, Object=0xbfc7f719) at
lighting.cpp:2365
#1  0x1852648 in pov::compute_lighted_texture (ResCol=0x7fffe298,
    Texture=0x1a05128, IPoint=0x7fffe2d8, Raw_Normal=0x7fffe2b8,
    Ray=0x1968b48, Weight=1, Intersect=0x7fffe358) at lighting.cpp:2301
#2  0x1851a94 in pov::do_texture_map (Result_Colour=0x7fffe298,
    Texture=0x19c0e28, IPoint=0x7fffe2d8, Raw_Normal=0x7fffe2b8,
    Ray=0x1968b48, Weight=1, Ray_Intersection=0x7fffe358, Shadow_Flag=0)
    at lighting.cpp:3606
#3  0x184c950 in pov::Determine_Apparent_Colour
(Ray_Intersection=0x7fffe358,
    Colour=0x7fffe468, Ray=0x1968b48, Weight=1) at lighting.cpp:621
#4  0x182c65c in pov::Trace_Primary_Ray (Ray=0x1968b48,
Colour=0x7fffe468,
    Weight=1, x=0) at vbuffer.cpp:327
#5  0x1815e70 in pov::trace_pixel (x=0, y=0, ColourClipped=0x19e9028,
    ColourUnclipped=0x7fffe468) at render.cpp:2629
#6  0x1813d18 in pov::Start_Non_Adaptive_Tracing () at render.cpp:1375
#7  0x1810ccc in pov::FrameRender () at rendctrl.cpp:520
#8  0x181063c in pov::FrameLoop () at rendctrl.cpp:261
#9  0x180e2ac in povray_cooperate () at povray.cpp:566
#10 0x18073b0 in main (argc=4, argv=0x7fffebbc) at unix.cpp:3003
#11 0x18037f4 in _start ()
#12 0x41932b04 in _rtld_start () from /usr/libexec/ld.elf_so
#13 0x7c0802a6 in ?? ()

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