I'm trying to install Digikam 0.7.1
During configuration I get this error message:

checking for X... configure: error: Can't find X includes. Please check your installation and add the correct paths!

I take it this is about the X-window. When I do a search for X11 and xorg, I get a long list of files. If this would help anyone understand what's going on, I'll post it.... I think I've installed everything with X11 and xorg in the name!

I also had this problem when trying to install Snort.

I know I'm a bit vague here, but if you had similar problems, maybe you could help?