#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
-#include "dlfcn.h"
+# define __USE_GNU
+# endif
+# include "dlfcn.h"
#endif
#if !(defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64))