I've been wondering what would it take exactly to create an
custom ICD? Is all the necessary information needed in the
specification, or can only Khronos members make custom ICDs? I'm
asking because I'm really interested in trying to do something
similar, but slightly different, to IBM's OpenCL Common Run-
time, which wraps multiple vendor ICDs in one.  Also, what are
the differences between an ICD in OpenCL and an ICD in OpenGL?
I'm using linux and don't see any /etc/OpenGL/vendors like there
is /etc/OpenCL/vendors. Are the requirements any different for
making a custom ICD for OpenGL?  Thanks for your feedback!