X's Pixmaps to OpenGL Textures

Hello List:

Anyone has ideas (code will be welcome as well) on how to
convert Pixmaps from 
X-Window to OpenGL Textures, without using the
GLX_EXT_texture_from_pixmap 
extension?

A pointer to the data in some format is nice also, as i can
use it with 
glTexImage2D() to upload the texture into the Card's
memory.
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