_dl_getenv
_dl_debug = _dl_getenv("LD_DEBUG", envp) != NULL;
_dl_libpath = _dl_split_path(_dl_getenv("LD_LIBRARY_PATH",
_dl_preload = _dl_getenv("LD_PRELOAD", envp);
_dl_bindnow = _dl_getenv("LD_BIND_NOW", envp) != NULL;
_dl_traceld = _dl_getenv("LD_TRACE_LOADED_OBJECTS", envp) != NULL;
_dl_tracefmt1 = _dl_getenv("LD_TRACE_LOADED_OBJECTS_FMT1", envp);
_dl_tracefmt2 = _dl_getenv("LD_TRACE_LOADED_OBJECTS_FMT2", envp);
_dl_traceprog = _dl_getenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", envp);
char *_dl_getenv(const char *, char **) __boot;
var = _dl_getenv("LD_TRACE_PLT", envp);
var = _dl_getenv("LD_TRACE_PLTSPEC", envp);