I added the lines to my CMakeLists but I am still getting build errors. Here is my updated CMake file cmake_minimum_required(VERSION 3.4 FATAL_ERROR) project(pandaScope) SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_CFLAGS} -O3 -Wall") set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin) set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/CMakeModules) find_package(OpenCV REQUIRED) find_package(GSL REQUIRED) find_package(Eigen3 3.3 REQUIRED NO_MODULE) find_package(Boost REQUIRED) find_package(INDI 1.7 REQUIRED) find_package(Nova REQUIRED) find_package(CFITSIO REQUIRED) add_library(cspice STATIC IMPORTED) set_property(TARGET cspice PROPERTY IMPORTED_LOCATION /usr/lib/cspice.a) INCLUDE_DIRECTORIES( ${Boost_INCLUDE_DIR} ) include_directories(${INDI_INCLUDE_DIR}) include_directories(${NOVA_INCLUDE_DIR}) include_directories(${CFITSIO_INCLUDE_DIR}) IF (CMAKE_BUILD_TYPE MATCHES COVERAGE) include(CodeCoverage) APPEND_COVERAGE_COMPILER_FLAGS() ENDIF (CMAKE_BUILD_TYPE MATCHES COVERAGE) set(SOURCE ${SOURCE} src/main.cpp src/focus/focuser.cpp src/detection/detection.cpp src/iod/state_generation.cpp src/iod/lambert_gooding.cpp src/batch/lambert.cpp src/batch/batch.cpp src/utilities/conversions.cpp src/utilities/kernels.cpp src/batch/propagator.cpp src/telescope/functions.cpp src/telescope/operation.cpp) set(HEADERS ${HEADERS} src/includes.hpp src/focus/focuser.hpp src/detection/detection.hpp src/iod/state_generation.hpp src/iod/lambert_gooding.hpp dependencies/cxxopts.hpp src/batch/lambert.hpp src/batch/batch.hpp src/utilities/conversions.hpp src/utilities/vectors.hpp src/utilities/kernels.hpp src/batch/propagator.hpp src/telescope/functions.hpp src/telescope/operation.hpp) add_subdirectory(testing) add_executable(pandaScope ${SOURCE} ${HEADERS}) target_link_libraries(pandaScope ${OpenCV_LIBS}) target_link_libraries(pandaScope usbp-1) target_link_libraries(pandaScope GSL::gsl GSL::gslcblas) target_link_libraries(pandaScope Eigen3::Eigen) target_link_libraries(pandaScope LINK_PUBLIC ${Boost_LIBRARIES}) target_link_libraries(pandaScope cspice) target_link_libraries(pandaScope ${INDI_CLIENT_LIBRARIES}) target_link_libraries(pandaScope ${INDI_LIBRARIES}) target_link_libraries(pandaScope ${NOVA_LIBRARIES}) target_link_libraries(pandaScope ${CFITSIO_LIBRARIES})Read More...