* files for more information.
*/
+/* needed if we want dladdr() and Dl_Info from glibc's dlfcn.h */
+#define _GNU_SOURCE
+
#include <stdio.h>
#include <signal.h>
#include "sbcl.h"
#include "thread.h"
#ifdef LISP_FEATURE_OS_PROVIDES_DLADDR
-# ifndef __USE_GNU
-/* __USE_GNU needed if we want dladdr() and Dl_Info from glibc. */
-# define __USE_GNU
-# endif
-# include "dlfcn.h"
+# include <dlfcn.h>
#endif
#if !(defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64))