I don't know but I thought that ./configure would pick up everything I have or not and react accordingly. It's bad if the install fails before it's even
finished.
What's GLX? It's not mentioned in my XF86Config and locate GLX only produced two man entries. My graphic card is a Diamond Stealth 64 PCI.
I'm no graphics expert, but IIRC GLX is a X extension that SGI invented so that X could use openGL. If it's missing, chances are you don't a have 3D driver for your card, or it isn't configured properly. Look for a good driver for your video card, or check the configuration. If you don't need 3D graphics, you can ignore the Xlib: extension "GLX" missing on display ":1.0". message, or use mesa (But it's very slow).
Ivan.