UDC and libX11 ?

[Jeremy C. Reed]

I also saw in libX11 configure:

if test xfalse = xtrue; then
   UDC_TRUE=
   UDC_FALSE='#'
else
   UDC_TRUE='#'
   UDC_FALSE=
fi


What is the purpose of this?
AM_CONDITIONAL(UDC, test xfalse = xtrue)

When can literal xfalse match literal xtrue?

I see it is used in src/Makefile.in, but as far as I see it is always 
commented out.

@UDC_TRUE at am__append_2 = udcInf.c


  Jeremy C. Reed

  	  	 	 Media Relations and Publishing Services
 	  	 	 http://www.reedmedia.net/