Correct the link with boost

CMakeLists.txt

@@ -41,7 +41,7 @@ PKG_CONFIG_APPEND_LIBS("sot-core")
 
 # Search for dependencies.
 # Boost
-SET(BOOST_COMPONENTS thread filesystem program_options unit_test_framework)
+SET(BOOST_COMPONENTS thread filesystem program_options unit_test_framework system)
 SEARCH_FOR_BOOST()
 
 ADD_REQUIRED_DEPENDENCY("jrl-mal >= 1.8.0")

unitTesting/CMakeLists.txt

@@ -142,7 +142,7 @@ FOREACH(test ${tests})
 
 	# Link against Boost.
 	IF (APPLE)
-		TARGET_LINK_LIBRARIES(${EXECUTABLE_NAME} ${Boost_LIBRARIES} boost_system)
+		TARGET_LINK_LIBRARIES(${EXECUTABLE_NAME} ${Boost_LIBRARIES} ${Boost_SYSTEM_LIBRARY})
 	ENDIF (APPLE)
 	ADD_TEST(${test} ${EXECUTABLE_NAME})