+PKG_CHECK_MODULES(check check)
+if(check_FOUND)
+ INCLUDE_DIRECTORIES(${INCLUDE_DIRS} ${check_INCLUDE_DIRS})
+ SET(link_libraries ${link_libraries} ${check_LDFLAGS})
+ add_subdirectory(session)
+else(check_FOUND)
+ MESSAGE(WARNING "check not found! no test!")
+endif(check_FOUND)