I am following tutorial for making a plugin given in tutorial of gazebo (link in description). When I try to compile the hello_world.cc file using cmake, I get this error :Configuring incomplete, errors occurred! How to resolve this ?

Link for tutorial : `http://gazebosim.org/tutorials?tut=plugins_hello_world&cat=write_plugin#CompilingthePlugin`. After that when I run make, it says : make: *** No targets specified and no makefile found. Stop.