Configuring Lyx

[Thomas.Beale]

I am trying to configure Lyx 1.1.5 fix 1 on Suse Linux v6.4.   When I
get to the configure stage I get the error message that it can't find my
X-windows libraries and/or headers.   I have tried specifying there
location with 

./configure --x-libraries=/usr/X11R6/lib/X11 

but this produces no change.    Do I need an additional set of libraries
that I have not installed?

Thanks