[CMake] include directories only for the target

And define scopes

python/CMakeLists.txt

@@ -38,11 +38,6 @@ SET_TARGET_PROPERTIES(python PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD True)
 # Name of the Python library
 SET(LIBRARY_NAME hppfcl)
 
-INCLUDE_DIRECTORIES("${Boost_INCLUDE_DIRS}" ${PYTHON_INCLUDE_DIRS})
-
-INCLUDE_DIRECTORIES("${CMAKE_SOURCE_DIR}/src")
-INCLUDE_DIRECTORIES("${CMAKE_CURRENT_BINARY_DIR}")
-
 SET(${LIBRARY_NAME}_HEADERS
   fcl.hh
   )
@@ -103,6 +98,9 @@ SET(${LIBRARY_NAME}_SOURCES
   )
 
 ADD_LIBRARY(${LIBRARY_NAME} SHARED ${${LIBRARY_NAME}_SOURCES} ${${LIBRARY_NAME}_HEADERS})
+TARGET_INCLUDE_DIRECTORIES(${LIBRARY_NAME} SYSTEM PRIVATE "${Boost_INCLUDE_DIRS}" ${PYTHON_INCLUDE_DIRS})
+TARGET_INCLUDE_DIRECTORIES(${LIBRARY_NAME} PRIVATE "${CMAKE_SOURCE_DIR}/src" "${CMAKE_CURRENT_BINARY_DIR}")
+
 ADD_DEPENDENCIES(python ${LIBRARY_NAME})
 ADD_HEADER_GROUP(${LIBRARY_NAME}_HEADER)
 ADD_SOURCE_GROUP(${LIBRARY_NAME}_SOURCES)