Incorrect Dynamic Libraries linking after explicit set in Cmake - linux

Question

I've got a very frustrating issue a the moment. I'm attempting to build an executable that uses ROS and a compiled Matlab .so file. Due to what I believe is a boost conflict, I'm trying to build this exe using an earlier version of boost. Now, I've set up the cmakelist file, ran catkin_make (as its a ros project) and everything compiles, and the correct boost version is seen.
However, when running a ldd on the compiled exe, it still seems to be linking to the more recent version. Its rather annoying. I've posted the cmakelists file, and the ldd outcome. My system is Ubuntu 14.04 with ROS Indigo.
Any help would be really good, as I'm pulling my hair out trying to figure out what is wrong!
Many thanks in advance!
##CMAKE FILE
cmake_minimum_required(VERSION 2.8.3)
project(testmatlabdll)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wfatal-errors -O4 -march=native")
add_definitions(-std=c++11)
find_package(catkin REQUIRED)
find_package(PCL 1.7 REQUIRED)
link_directories(${PCL_LIBRARY_DIRS})
include_directories(${PCL_INCLUDE_DIRS})
add_definitions(${PCL_DEFINITIONS})
set(Boost_NO_SYSTEM_PATHS ON)
set(BOOST_ROOT /home/devbot/Downloads/boost_1_50_0)
set(BOOST_DIR /home/devbot/Downloads/boost_1_50_0)
set(Boost_INCLUDE_DIR /home/devbot/Downloads/boost_1_50_0)
set(BOOST_INCLUDEDIR /home/devbot/Downloads/boost_1_50_0)
set(Boost_USE_STATIC_LIBS OFF)
set(Boost_USE_MULTITHREADED ON)
message(STATUS "BOOST_ROOT = ${BOOST_ROOT}")
message(STATUS "Boost_VERSION = ${Boost_VERSION}")
message(STATUS "Boost_LIB_VERSION = ${Boost_LIB_VERSION}")
message(STATUS "Boost_MAJOR_VERSION = ${Boost_MAJOR_VERSION}")
message(STATUS "Boost_MINOR_VERSION = ${Boost_MINOR_VERSION}")
message(STATUS "Boost_LIBRARIES = ${Boost_LIBRARIES}")
message(STATUS "Boost_INCLUDE_DIRS = ${Boost_INCLUDE_DIRS}")
message(STATUS "Boost_LIBRARY_DIRS = ${Boost_LIBRARY_DIRS}")
find_package(Boost COMPONENTS REQUIRED
system filesystem thread date_time iostreams serialization chrono)
find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs message_generation image_transport cv_bridge)
find_package(OpenCV REQUIRED)
catkin_package(CATKIN_DEPENDS roscpp
std_msgs
pcl_ros
sensor_msgs
cv_bridge
message_runtime
LIBRARIES ${PROJECT_NAME}
DEPENDS system_lib)
include_directories(include ${catkin_INCLUDE_DIRS})
include_directories(${OpenCV_INCLUDE_DIRS})
include_directories(/usr/local/MATLAB/R2013b/extern/include/)
include_directories(/opt/matlab/extern/include)
include_directories(/home/devbot/catkin_ws/src/testmatlabdll/src)
link_directories(/home/devbot/catkin_ws/src/testmatlabdll/src)
add_library(mwmc SHARED IMPORTED)
set_property(TARGET mwmc PROPERTY IMPORTED_LOCATION /usr/local/MATLAB/MATLAB_Compiler_Runtime/v82/runtime/glnxa64/libmwmclmcrrt.so)
add_executable(testMatlab src/testMatlab.cpp)
target_link_libraries(testMatlab ${Boost_LIBRARIES} ${catkin_LIBRARIES} ${PCL_LIBRARIES} ${OpenCV_LIBRARIES})
target_link_libraries(testMatlab roughlib mwmc)
OUTPUT FROM LDD
ldd testMatlab | grep boost
libboost_system.so.1.50.0 => /home/devbot/Downloads/boost_1_50_0/stage/lib/libboost_system.so.1.50.0 (0x00007f7456f8a000)
libboost_system.so.1.54.0 => /usr/lib/x86_64-linux-gnu/libboost_system.so.1.54.0 (0x00007f7454662000)
libboost_thread.so.1.54.0 => /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.54.0 (0x00007f745444c000)
libboost_filesystem.so.1.54.0 => /usr/lib/x86_64-linux-gnu/libboost_filesystem.so.1.54.0 (0x00007f7454018000)
libboost_regex.so.1.54.0 => /usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0 (0x00007f744d5d8000)