foreach (_ns3_ver ${NS3_KNOWN_VERSIONS})
list(APPEND _ns3_LIB_SEARCH_DIRS "ns${_ns3_ver}-core" "ns${_ns3_ver}-core-optimized" "ns${_ns3_ver}-core-debug" "ns${_ns3_ver}-core-default")
foreach (_ns3_ver ${NS3_KNOWN_VERSIONS})
list(APPEND _ns3_LIB_SEARCH_DIRS "ns${_ns3_ver}-core" "ns${_ns3_ver}-core-optimized" "ns${_ns3_ver}-core-debug" "ns${_ns3_ver}-core-default")