[vtkusers] FL/Fl.h not found

[kshivann at engineering.uiowa.edu]

hi,
  i am coupling vtk and fltk. when i try execute the program i get the error 
message " FL/Fl.h file not found". i have included both vtk and fltk in the 
cmake file. i have the same setup on a different computer and it works but not 
on the one that i am trying to install.

thanks

kiran