Build packages with more than one .cpp

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I have received some packages from Fuerte which I need to compile in Hydro with catkin. Each package has more than one source file .cpp

In rosbuild, there was:

rosbuild_add_executable([file1])

rosbuild_add_executable([file2])

In catkin I did the same but with add_executable

The problem is that if I add both files (with different names of executables of course) the program doesn't compile If I omit one of them, everything works properly, but I need both. I don't know if the solution is to create two packages or I need to add anything to CMakeLists.txt

    cmake_minimum_required(VERSION 2.8.3)
    project(test_imu)

    ## Find catkin macros and libraries
    ## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
    ## is used, also find other catkin packages
    find_package(catkin REQUIRED COMPONENTS
        message_generation
        nav_msgs 
        robotnik_msgs
        roscpp 
        sensor_msgs 
        geometry_msgs
        )

    ## System dependencies are found with CMake's conventions
    # find_package(Boost REQUIRED COMPONENTS system)
    find_package(MRPT REQUIRED 
        gui
        slam
        )
    find_package(gazebo REQUIRED)
    include_directories(include ${catkin_INCLUDE_DIRS} ${GAZEBO_INCLUDE_DIRS} ${SDFormat_INCLUDE_DIRS})
    include_directories("/home/summitxl/catkin_ws/src/Ensayos/test_imu/include")


    ## Uncomment this if the package has a setup.py. This macro ensures
    ## modules and global scripts declared therein get installed
    ## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
    # catkin_python_setup()

    ################################################
    ## Declare ROS messages, services and actions ##
    ################################################

    ## To declare and build messages, services or actions from within this
    ## package, follow these steps:
    ## * Let MSG_DEP_SET be the set of packages whose message types you use in
    ##   your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
    ## * In the file package.xml:
    ##   * add a build_depend and a run_depend tag for each package in MSG_DEP_SET
    ##   * If MSG_DEP_SET isn't empty the following dependencies might have been
    ##     pulled in transitively but can be declared for certainty nonetheless:
    ##     * add a build_depend tag for "message_generation"
    ##     * add a run_depend tag for "message_runtime"
    ## * In this file (CMakeLists.txt):
    ##   * add "message_generation" and every package in MSG_DEP_SET to
    ##     find_package(catkin REQUIRED COMPONENTS ...)
    ##   * add "message_runtime" and every package in MSG_DEP_SET to
    ##     catkin_package(CATKIN_DEPENDS ...)
    ##   * uncomment the add_*_files sections below as needed
    ##     and list every .msg/.srv/.action file to be processed
    ##   * uncomment the generate_messages entry below
    ##   * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

    ## Generate messages in the 'msg' folder
    # add_message_files(
    #   FILES
    #   Message1.msg
    #   Message2.msg
    # )
## Generate services in the 'srv' folder
# add_service_files(
#   FILES
#   Service1.srv
#   Service2.srv
# )

## Generate actions in the 'action' folder
# add_action_files(
#   FILES
#   Action1.action
#   Action2.action
# )

## Generate added messages and services with any dependencies listed here
# generate_messages(
#   DEPENDENCIES
#   std_msgs  # Or other packages containing msgs
# )

###################################
## catkin specific configuration ##
###################################
## The catkin_package macro generates cmake config files for your package
## Declare things to be passed to dependent projects
## INCLUDE_DIRS: uncomment this if you package contains header files
## LIBRARIES: libraries you create in this project that dependent projects also need
## CATKIN_DEPENDS: catkin_packages dependent projects also need
## DEPENDS: system dependencies of this project that dependent projects also need
catkin_package(
#  INCLUDE_DIRS include
#  LIBRARIES test_imu
#  CATKIN_DEPENDS other_catkin_pkg
   DEPENDS gazebo_ros
)

###########
## Build ##
###########

## Specify additional locations of header files
## Your package locations should be listed before other locations

## Declare a cpp library
# add_library(test_imu
#   src/${PROJECT_NAME}/test_imu.cpp
# )

## Declare ...