#8 gvx gives a segmentation fault on amd64

[Pedro F. Giffuni]

This is for geomview 1.8.1, however the latest version (1.9.4) also coredumps.
__________
gdb ./src/bin/geomview/x11/gvx gvx.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
Core was generated by `gvx'.
Program terminated with signal 11, Segmentation fault.
...
#0 0x000000000047937b in RefDecr ()
(gdb) bt
#0 0x000000000047937b in RefDecr ()
#1 0x000000000046538e in ApDelete ()
#2 0x000000000042f617 in GeomDelete ()
#3 0x0000000000431efb in InstCreate ()
#4 0x000000000042f1ba in GeomCreate ()
#5 0x000000000041e544 in make_light ()
#6 0x000000000041e720 in build_light_rack ()
#7 0x000000000041e9e5 in clight_init ()
#8 0x000000000040e991 in ui_init ()
#9 0x0000000000420b65 in init_geomview ()
#10 0x000000000040bed5 in main ()