cmakelists compiling questions

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Hi, this is a new linux user. When I compile my CMakelists, it gives me this error.

/usr/bin/ld: //usr/local/lib/libjsoncpp.a(json_reader.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPI
C
//usr/local/lib/libjsoncpp.a: error adding symbols: Bad value

I want to add my own global planner into the ros navigation stack. So I replace everything in carrort planner with "test_planner", and nothing changed otherwise. Now I want to change the content of Make_plan function to make my own plan. I read the pose from a .json file, so I have to use libjsoncpp. So I go to CMakelists.txt, and change the code below:

add_library(test_planner src/test_planner.cpp) 
target_link_libraries(test_planner
${catkin_LIBRARIES}
)

to:

add_library(test_planner src/test_planner.cpp) 
target_link_libraries(test_planner
${catkin_LIBRARIES}
jsoncpp
)

jsoncpp can be used to call libjsoncpp in my directory:/usr/local/lib.libjosncpp.a, this kind of change can be used for my other file compiling but not for this pluggin. It gives this errormessage:

/usr/bin/ld: //usr/local/lib/libjsoncpp.a(json_reader.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPI
C
//usr/local/lib/libjsoncpp.a: error adding symbols: Bad value

I have no idea how to fix this error in Cmakelists.txt.

Here is my CMakelists.txt:

cmake_minimum_required(VERSION 2.8.3)
project(test_planner)

find_package(catkin REQUIRED
        COMPONENTS
            roscpp
            tf
            nav_core
            costmap_2d
            base_local_planner
            pluginlib
        )

include_directories(
    include 
    ${catkin_INCLUDE_DIRS}
    )
add_definitions(${EIGEN_DEFINITIONS})

catkin_package(



 INCLUDE_DIRS include
    LIBRARIES test_planner
    CATKIN_DEPENDS
        roscpp
        pluginlib
        costmap_2d
        base_local_planner
        nav_core
)

add_library(test_planner src/test_planner.cpp)
target_link_libraries(test_planner
    ${catkin_LIBRARIES}
    jsoncpp
    )

install(TARGETS test_planner
       ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
       LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
       )

install(DIRECTORY include/${PROJECT_NAME}/
  DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
  PATTERN ".svn" EXCLUDE
)

install(FILES bgp_plugin.xml
    DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
)