Make -lrt optional; it's not present and shm_open in libc on _APPLE_.
Make -lrt optional; it's not present and shm_open in libc on _APPLE_.

elbakai/Overpass-API,bhargavpanth/Overpass-API,drolbr/Overpass-API,elbakai/Overpass-API,bhargavpanth/Overpass-API,elbakai/Overpass-API,elbakai/Overpass-API,mmd-osm/Overpass-API,bhargavpanth/Overpass-API,drolbr/Overpass-API,elbakai/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,bhargavpanth/Overpass-API,bhargavpanth/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,elbakai/Overpass-API,bhargavpanth/Overpass-API