how to convert files into executable files

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I'm using ros-fuerte distro in ubuntu12.04 I have written two cpp file named talker.cpp and listener.cpp in src and i add two lines seeing below in CMakeLists.txt file

rosbuild_add_executable(talker src/talker.cpp) rosbuild_add_executable(listener src/listener.cpp)

now when i give a command $make it displays

make: * No targets specified and no makefile found. Stop. actually the two files are not found in bin directory would you pleas help me how to convert cpp files to executable files and how to execute that nodes in ROS environment please explain me in steps