Include cstdlib instead of stdlib.h.
#include <vespa/vespalib/util/size_literals.h>
#include <vespa/vespalib/objects/nbostream.h>
#include <vespa/fastos/file.h>
-#include <stdlib.h>
#include <cassert>
+#include <cstdlib>
#include <vespa/log/log.h>
LOG_SETUP(".searchlib.common.bitvector");
