rospeex dependency libraries error

I recently install the [rospeex package](http://rospeex.org/top/) and I managed to run the Talking Watch sample with the following command: roslaunch rospeex_samples talking_watch_cpp_en_local.launch However, if I try to make my own package (named extras) and copy-paste the same code shown in the example in a script called speech_rec.cpp I get the following error: Linking CXX executable ../bin/speech_rec /opt/ros/hydro/lib/librospeex_if.so: undefined reference to `ros::package::getPath(std::basic_string, std::allocator> const&)' Is there any way to solve it? I think I'm not linking the libraries correctly (I'm new in ROS). I'm using Ubuntu 12.04, ROS distro Hydro and rosbuild. My CMakeList.txt is: cmake_minimum_required(VERSION 2.4.6) include($ENV{ROS_ROOT}/core/rosbuild/rosbuild.cmake) rosbuild_init() set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin) set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib) rosbuild_add_executable(speech_rec src/speech_rec.cpp) And my manifest.xml is: extrasClBSDhttp://ros.org/wiki/extras