Hi there!
looks like you're posting from a Mac. Please tell us what Linux distro you're using; that may be relevant to those trying to help you.
It isn't a good sign that you get a segfault or signal 11 when running that command so you probably should try to figure out what is causing that; creating an xorg.conf manually is fine (I do that too) but in this case, it seems you're avoiding a problem that needs to be fixed:
why the segfault. X may not work even if you put an xorg.conf file in place.
Anyhow, for generic xorg.conf files, many distros will put a couple in the /etc/X11/ directory. One example that may be there is called
xorg.conf-vesa or very similar to this. You'll possibly still need to go through it and configure it a little bit for your system, but it uses the VESA driver, and that should work for nearly any card out there. Possibly you will want to set a specific resolution or whatever, if it chooses one that you don't like.
So, let us know what's going on after you get an xorg.conf file, and/or get stuck as you continue working on this.
Cheers