Link just against required VTK modules on Linux.

Note:
If VTK is installed below /opt or anywhere else just add a path to GLOB_RECURSE.

src/Mod/Fem/App/CMakeLists.txt

@@ -22,7 +22,7 @@ include_directories(
     ${XercesC_INCLUDE_DIRS}
     ${SMESH_INCLUDE_DIR}
     ${NETGEN_INCLUDE_DIRS}
-    ${VTK_INCLUDE_DIR}
+    ${VTK_INCLUDE_DIRS}
 )
 
 link_directories(${OCC_LIBRARY_DIR})
@@ -43,16 +43,8 @@ if(BUILD_FEM_NETGEN)
     )
 endif(BUILD_FEM_NETGEN)
 
-if(BUILD_FEM_VTK)
-    set(Fem_LIBS
-        ${Fem_LIBS}
-        ${VTK_LIBRARIES}
-    )
-endif(BUILD_FEM_VTK)
-
 generate_from_xml(FemMeshPy)
 
-
 SET(Python_SRCS
     FemMeshPy.xml
     FemMeshPyImp.cpp

src/Mod/Fem/CMakeLists.txt

@@ -3,8 +3,6 @@ if(BUILD_FEM_VTK)
     add_definitions(-DFC_USE_VTK)
 endif(BUILD_FEM_VTK)
 
-include(${VTK_USE_FILE})
-
 add_subdirectory(App)
 
 if(BUILD_GUI)

src/Mod/Fem/Gui/CMakeLists.txt

@@ -7,8 +7,6 @@ endif(MSVC)
 if(BUILD_FEM_NETGEN)
     add_definitions(-DFCWithNetgen)
 endif(BUILD_FEM_NETGEN)
-find_package(VTK REQUIRED)
-include(${VTK_USE_FILE})
 
 include_directories(
     ${CMAKE_BINARY_DIR}
@@ -22,7 +20,7 @@ include_directories(
     ${PYTHON_INCLUDE_DIRS}
     ${XercesC_INCLUDE_DIRS}
     ${SMESH_INCLUDE_DIR}
-    ${VTK_INCLUDE_DIR}
+    ${VTK_INCLUDE_DIRS}
 )
 
 link_directories(${OCC_LIBRARY_DIR})
@@ -34,13 +32,6 @@ set(FemGui_LIBS
     FreeCADGui
 )
 
-if(BUILD_FEM_VTK)
-    set(FemGui_LIBS
-        ${FemGui_LIBS}
-        ${VTK_LIBRARIES}
-    )
-endif(BUILD_FEM_VTK)
-
 generate_from_xml(ViewProviderFemMeshPy)
 
 SET(Python_SRCS
@@ -331,7 +322,7 @@ SET(FemGui_SRCS
 
 
 add_library(FemGui SHARED ${FemGui_SRCS})
-target_link_libraries(FemGui ${FemGui_LIBS})
+target_link_libraries(FemGui ${FemGui_LIBS} ${VTK_LIBRARIES})
 
 
 fc_target_copy_resource(FemGui

src/Mod/MeshPart/App/CMakeLists.txt

@@ -6,7 +6,6 @@ endif(MSVC)
 
 if (BUILD_SMESH)
     add_definitions(-DHAVE_SMESH -DHAVE_MEFISTO)
-    include(${VTK_USE_FILE})
 endif(BUILD_SMESH)
 
 if(BUILD_FEM_NETGEN)
@@ -21,6 +20,7 @@ include_directories(
     ${PYTHON_INCLUDE_DIRS}
     ${XercesC_INCLUDE_DIRS}
     ${SMESH_INCLUDE_DIR}
+    ${VTK_INCLUDE_DIRS}
 )