cmake does non link ncurses

For the super noob, remember target_link_libraries() needs to be below add_executable():

cmake_minimum_required(VERSION 2.8) project(main)

find_package(Curses REQUIRED)
include_directories(${CURSES_INCLUDE_DIR})

add_executable(main main.cpp)
target_link_libraries(main ${CURSES_LIBRARIES})

before use some third party libs, you ought to find it! in case of ncurses you need to add find_package(Curses REQUIRED) and then use ${CURSES_LIBRARIES} in a call to target_link_libraries() and target_include_directories(... ${CURSES_INCLUDE_DIR}).