Help with wmpower and/or wmacpi

Just wondering if anyone could offer advice. I am trying to install the wmpower or wmacpi applet from dockapps.org and they are failing. The make keeps look for a X.h and xpm.h files in the /usr/X11R6/include/X11 directory. These files are not there nor anywhere on the HD that I can find (unless my grep search was typed incorrectly). Also I couldn't find any packages in my install software that discribed these files. :cry:

I have tries installing these two applets on both SuSE 7.2 and Mandrake 9.0 and both machines can't find these files. Any help would be appreciated to find these files for install or on my HD.

Check in their INSTALL files, or at their web pages. Does it list some dependencies wich you do not have?