Make : make[2]: *** No rule to make target '<path/to/.so>', needed by '<target>'. Stop

Question

I am trying to include third-party libraries to my project and build with CMake.

The source to be built is main.cpppresent under /src.

My project directory is as follows -

   |-src
   |---main.cpp
   |-third-party
   |---ccalib_mdf
   |-----include
   |-----lib
   |-------libccalib_mdf-2-2-1.so
   |---dbcppp
   |-----include
   |-------dbcppp
   |-------libxmlmm
   |---------include
   |-----lib
   |-------libdbcppp.so
   |-------libxmlmm.so
   |-CMakeList.txt

I add my executable -

add_executable(mdf4_transcoder ${PROJECT_SOURCE_DIR}/main.cpp)  

I include the directories -

include_directories(mdf4_transcoder PRIVATE "third-party/ccalib_mdf/include")
include_directories(mdf4_transcoder PRIVATE "third-party/dbcppp/include/dbcppp")
include_directories(mdf4_transcoder PRIVATE "third-party/dbcppp/include/libxmlmm/include")

And try to link the directories and libraries-

target_link_directories(mdf4_transcoder PRIVATE "third-party/ccalib_mdf/lib")
target_link_directories(mdf4_transcoder PRIVATE "third-party/dbcppp/lib")

target_link_libraries(mdf4_transcoder Pcap++ Packet++ Common++ pcap pthread)
target_link_libraries(mdf4_transcoder ${CMAKE_SOURCE_DIR}/third-party/ccalib_mdf/lib/libccalib_mdf_x64_2-2-1.so )
target_link_libraries(mdf4_transcoder ${CMAKE_SOURCE_DIR}/third-party/dbcppp/lib/libdbcppp.so )
target_link_libraries(mdf4_transcoder ${CMAKE_SOURCE_DIR}/third-party/dbcppp/lib/libxmlmm.so)

And I run the build process. However, this error is produced -

make[2]: *** No rule to make target '/usr/src/src/repair_service/transcoder/third-party/ccalib_mdf/lib/libccalib_mdf_x64_2-2-1.so', needed by 'mdf4_transcoder'.  Stop.

As it is a library built outside the project, I am unable to find the reason behind this error to occur. I searched for solutions, but found none where this error for a shared library is discussed.

Note: This build process runs on cloud. I have no direct access to the environment.