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I am assuming you are using rosmake and not catkin to build your node. In your CMakeLists.txt file add the following lines:

rosbuild_add_boost_directories ()
rosbuild_link_boost (${BINNAME} signals)

where ${BINNAME} is the name of the executable you are building with rosbuild_add_executable. Note that you have to add those two lines after the line with rosbuild_add_executable.