The command "make" fails on linux.

[Hack06]

After the command "cmake ." I run the command "make" but it fails with the following message:

PlayCap-0.1.1-Source/AboutWindow.h:25:16: fatal error: fx.h: No such file or directory
compilation terminated.
CMakeFiles/playcap.dir/build.make:62: recipe for target 'CMakeFiles/playcap.dir/AboutWindow.o' failed
make[2]: *** [CMakeFiles/playcap.dir/AboutWindow.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/playcap.dir/all' failed
make[1]: *** [CMakeFiles/playcap.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2