ben-desktop:/home/ben/wizardpen-driver-0.5.0# xmkmf
imake -DUseInstalled -I/usr/lib/X11/config
In file included from /usr/lib/X11/config/Imake.tmpl:2293,
                 from Imakefile.c:40:
./Imakefile:5: error: /usr/X11R6/lib/X11/config/Server.tmpl: No such file or directory
imake: Exit code 1.
  Stop.
ben-desktop:/home/ben/wizardpen-driver-0.5.0# apt-get install x-dev libx11-dev libxext-dev
Reading package lists... Done
Building dependency tree... Done
x-dev is already the newest version.
libx11-dev is already the newest version.
libxext-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.