This little proggy creates a core dump (when it shouldn't):

#include <GL/gl.h>

int main() {

  glXGetCurrentContext();

  return 0;
}

compile: gcc -o glx glx.c  -lGL

This is what gdb says:

#0  0x4013f6d0 in glXGetCurrentContext () from /usr/lib/libGL.so.1

regards,

Bernhard Ege