Some problem with ubuntu14.04

I have install the gtk2.0 gtk-3-dev apt-get install libgtk2.0-dev libgtk-3-dev

but while I mkdir build in the project directory. Then cd build cmake .. the error occured shown below:

$ cmake ..
-- Gtk2Fortran not found trying Gtk3Fortran
CMake Error at CMakeLists.txt:80 (message):
  Gtk3Fortran Not found either, aborting

I don't know why,could you give me some advice.You know I have build the gtk-fortran well.But why not RPNcalc.