Some CMake improvements

We need some bigger CMake improvements, but these changes already help our usecase :)

CMakeLists.txt

@@ -59,8 +59,8 @@ link_directories (${CMAKE_BINARY_DIR} ${LIBRARY_DIRS} )
 add_library (HexEx SHARED ${SOURCES})
 add_library (HexExStatic STATIC ${SOURCES})
 
-target_link_libraries (HexEx ${LIBRARIES})
-target_link_libraries (HexExStatic ${LIBRARIES})
+target_link_libraries (HexEx ${LIBRARIES} OpenVolumeMesh)
+target_link_libraries (HexExStatic ${LIBRARIES} OpenVolumeMesh)
 
 #
 # In order for the exact predicates to work the compiler
@@ -108,12 +108,24 @@ set_target_properties (HexEx
     CXX_STANDARD 11
     )
 
+target_include_directories(HexEx
+        INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+        )
+target_include_directories(HexExStatic
+        INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+        )
+
 set_target_properties (HexExStatic
     PROPERTIES
     COMPILE_FLAGS "${HEXEX_COMPILE_FLAGS}"
     DEFINE_SYMBOLS "-DHEXEX_EXPORT_SYMBOLS"
     CXX_STANDARD 11
     )
+set_property(TARGET HexExStatic PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 
@@ -154,3 +166,5 @@ endif()
 #        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/doc
 #        COMMENT "Generating Doxygen documentation" VERBATIM)
 #endif()
+
+list(REMOVE_AT CMAKE_MODULE_PATH -1)