Linking error in project : cmake - c++

Question

This is the directory structure of my project:
|-- CMakeLists.txt
|-- libdashframework
| |-- Buffer
| | |-- IMediaObjectBufferObserver.h
| | |-- MediaObjectBuffer.cpp
| | `-- MediaObjectBuffer.h
| |-- Input
| | |-- DASHReceiver.cpp
| | |-- DASHReceiver.h
| | |-- IDASHReceiverObserver.h
| | `-- MediaObject.h
| |-- MPD
| | |-- AbstractRepresentationStream.cpp
| | |-- AbstractRepresentationStream.h
| | |-- AdaptationSetStream.cpp
| | |-- AdaptationSetStream.h
| | |-- BaseUrlResolver.cpp
| | |-- BaseUrlResolver.h
| | |-- IRepresentationStream.h
| | |-- RepresentationStreamFactory.cpp
| | |-- RepresentationStreamFactory.h
| | |-- SegmentListStream.cpp
| | |-- SegmentListStream.h
| | |-- SegmentTemplateStream.cpp
| | |-- SegmentTemplateStream.h
| | |-- SingleMediaSegmentStream.cpp
| | |-- SingleMediaSegmentStream.h
| | |-- TimeResolver.cpp
| | `-- TimeResolver.h
| `-- Portable
| |-- MultiThreading.cpp
| `-- MultiThreading.h
|-- libdash_test_automoc.cpp
|-- libdash_test.cpp
`-- Makefile
I am having a linking error in the project and can't figure out how to remove it.
CMakeLists.txt:
cmake_minimum_required(VERSION 2.8)
file(GLOB test_source RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
libdashframework/MPD/*.cpp
libdashframework/Buffer/*.cpp
libdashframework/Input/*.cpp
libdashframework/Portable/*.cpp
libdash_test.cpp )
add_executable(libdash_test ${test_source})
target_link_libraries(libdash_test dash -lpthread)
Error:
Linking CXX executable libdash_test
CMakeFiles/libdash_test.dir/libdashframework/Buffer/MediaObjectBuffer.cpp.o: In function `libdash::framework::buffer::MediaObjectBuffer::SetEOS(bool)':
MediaObjectBuffer.cpp:(.text+0x55d): undefined reference to `libdash::framework::input::MediaObject::AbortDownload()'
CMakeFiles/libdash_test.dir/libdashframework/Input/DASHReceiver.cpp.o: In function `libdash::framework::input::DASHReceiver::GetNextSegment()':
DASHReceiver.cpp:(.text+0x48e): undefined reference to `libdash::framework::input::MediaObject::MediaObject(dash::mpd::ISegment*, dash::mpd::IRepresentation*)'
CMakeFiles/libdash_test.dir/libdashframework/Input/DASHReceiver.cpp.o: In function `libdash::framework::input::DASHReceiver::GetSegment(unsigned int)':
DASHReceiver.cpp:(.text+0x57f): undefined reference to `libdash::framework::input::MediaObject::MediaObject(dash::mpd::ISegment*, dash::mpd::IRepresentation*)'
CMakeFiles/libdash_test.dir/libdashframework/Input/DASHReceiver.cpp.o: In function `libdash::framework::input::DASHReceiver::GetInitSegment()':
DASHReceiver.cpp:(.text+0x615): undefined reference to `libdash::framework::input::MediaObject::MediaObject(dash::mpd::ISegment*, dash::mpd::IRepresentation*)'
CMakeFiles/libdash_test.dir/libdashframework/Input/DASHReceiver.cpp.o: In function `libdash::framework::input::DASHReceiver::DownloadInitSegment(dash::mpd::IRepresentation*)':
DASHReceiver.cpp:(.text+0x9b0): undefined reference to `libdash::framework::input::MediaObject::StartDownload()'
CMakeFiles/libdash_test.dir/libdashframework/Input/DASHReceiver.cpp.o: In function `libdash::framework::input::DASHReceiver::DoBuffering(void*)':
DASHReceiver.cpp:(.text+0xa84): undefined reference to `libdash::framework::input::MediaObject::StartDownload()'
DASHReceiver.cpp:(.text+0xab5): undefined reference to `libdash::framework::input::MediaObject::WaitFinished()'
collect2: error: ld returned 1 exit status
make[2]: *** [libdash_test] Error 1
make[1]: *** [CMakeFiles/libdash_test.dir/all] Error 2
make: *** [all] Error 2
How can I remove this linking error?
After reading other similar questions, I have tried and changed the order of files in file() function. The order is similar to a working sample project so I think thats not the problem.
EDIT:
Although I had already linked the so file of libdash by putting it in the /usr/bin and /usr/lib/ dir. But I also updated the cmake too. It still didn't help.
updated CMakeLists.txt:
cmake_minimum_required(VERSION 2.8)
project(libdash_test)
set(CMAKE_VERBOSE_MAKEFILE ON)
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_MODULE_PATH})
set(CMAKE_CXX_FLAGS "-D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS")
# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
#libdash has to be manually installed
set (DASH_INCLUDE_DIR /usr/include/libdash)
find_package(DASH REQUIRED)
link_directories(${DASH_LIBRARIES})
#set(LIBDASH_LIBRARIES "../build/bin" CACHE PATH "Path to libdash.so")
#set(LIBDASH_INCLUDES "../libdash/include/" CACHE PATH "Path to libdash includes")
file(GLOB test_source RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
libdashframework/MPD/*.cpp
libdashframework/Buffer/*.cpp
libdashframework/Input/*.cpp
libdashframework/Portable/*.cpp
libdash_test.cpp )
add_executable(libdash_test ${test_source})
target_link_libraries(libdash_test DASH -ldash ${DASH_LIBRARIES} -lpthread)
Error in the current CMakeLists.txt (the one under EDIT):
CMake Error at CMakeLists.txt:20 (find_package):
By not providing "FindDASH.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "DASH", but
CMake did not find one.
Could not find a package configuration file provided by "DASH" with any of
the following names:
DASHConfig.cmake
dash-config.cmake
Add the installation prefix of "DASH" to CMAKE_PREFIX_PATH or set
"DASH_DIR" to a directory containing one of the above files. If "DASH"
provides a separate development package or SDK, be sure it has been
installed.
-- Configuring incomplete, errors occurred!