CMake: Use Coin3d CMake target directly if one exists.

CMakeLists.txt

@@ -69,7 +69,6 @@ if(NOT FREECAD_LIBPACK_USE OR FREECAD_LIBPACK_CHECKFILE_CLBUNDLER OR FREECAD_LIB
         # OPENGL_gl_LIBRARY empty that results into linker errors
         SetupOpenGL()
     endif(BUILD_GUI)
-    SetupBoost()
     SetupSalomeSMESH()
     if (BUILD_FEM_NETGEN)
         find_package(NETGEN)
@@ -89,6 +88,9 @@ if(NOT FREECAD_LIBPACK_USE OR FREECAD_LIBPACK_CHECKFILE_CLBUNDLER OR FREECAD_LIB
         SetupShibokenAndPyside()
         SetupMatplotlib()
     endif(BUILD_GUI)
+
+    # SetupCoin3D can overwrite find_package(Boost) output so keep this after.
+    SetupBoost()
 endif()
 
 if(BUILD_VR)

cMake/FreeCAD_Helpers/SetupCoin3D.cmake

@@ -14,6 +14,7 @@ macro(SetupCoin3D)
         if (Coin_FOUND)
             set(COIN3D_INCLUDE_DIRS ${Coin_INCLUDE_DIR})
             set(COIN3D_LIBRARIES ${Coin_LIBRARIES})
+            set(COIN3D_LIB_DIRS ${Coin_LIB_DIR})
         endif ()
     ENDIF ()
 

src/Gui/CMakeLists.txt

@@ -58,7 +58,6 @@ include_directories(
     ${CMAKE_CURRENT_BINARY_DIR}/DAGView
     ${Boost_INCLUDE_DIRS}
     ${EIGEN3_INCLUDE_DIR}
-    ${COIN3D_INCLUDE_DIRS}
     ${PYTHON_INCLUDE_DIRS}
     ${XercesC_INCLUDE_DIRS}
     ${ZLIB_INCLUDE_DIR}
@@ -74,7 +73,6 @@ endif(MSVC)
 if(MSVC)
     set(FreeCADGui_LIBS
          FreeCADApp
-         ${COIN3D_LIBRARIES}
          ${OPENGL_gl_LIBRARY}
     )
 
@@ -87,13 +85,20 @@ if(MSVC)
 else(MSVC)
     set(FreeCADGui_LIBS
         FreeCADApp
-        ${COIN3D_LIBRARIES}
         ${Boost_LIBRARIES}
         ${OPENGL_gl_LIBRARY}
         ${3DCONNEXION_LINKFLAGS}
     )
 endif(MSVC)
 
+if (TARGET Coin::Coin)
+    list(APPEND FreeCADGui_LIBS Coin::Coin)
+else()
+    include_directories(${COIN3D_INCLUDE_DIRS})
+    link_directories(${COIN3D_LIB_DIRS})
+    list(APPEND FreeCADGui_LIBS ${COIN3D_LIBRARIES})
+endif()
+
 if (WIN32)
     if(FREECAD_QT_MAJOR_VERSION EQUAL 6)
         list(APPEND FreeCADGui_LIBS