Compiling from sources (ubuntu and x11)

 am using ubuntu 9.10 and I am getting and x11 lib/headers not found.
I have installed libx11-dev.  I thought this would solve the problem,
but it is not.  Any help would be appreciated.

Looking at output of the configure script you should be able to
know what specific file is missing. Then you can "Search the
contents of packages" at http://packages.ubuntu.com/ to know what
package contains the missing file.