@@ -466,10 +466,11 @@
 		AC_DEFINE(HAVE_RANDOM, 1, [Whether we have random()])
 	])
 ])
 
 AC_CHECK_LIB(dl, dlopen, LIBS="$LIBS -ldl")
+AC_CHECK_HEADERS(dlfcn.h)
 
 AC_ARG_ENABLE(threads,
 	AS_HELP_STRING([--disable-threads], [disable thread support]))
 AS_IF([test x"$enable_threads" != x"no"], [
 	case "$host_os" in
@@ -748,11 +749,20 @@
 AS_IF([test x"$have_processes" = x"yes"], [
 	AC_SUBST(OFPROCESS_M, "OFProcess.m")
 	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
 ])
 
-AC_CHECK_HEADERS(execinfo.h)
+AC_MSG_CHECKING(for __builtin_return_address)
+AC_TRY_LINK([], [
+	__builtin_return_address(0);
+], [
+	AC_MSG_RESULT(yes)
+	AC_DEFINE(HAVE_BUILTIN_RETURN_ADDRESS, 1,
+		[Whether we have __builtin_return_address])
+], [
+	AC_MSG_RESULT(no)
+])
 
 AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
 	AC_CHECK_HEADER(Foundation/NSObject.h, [
 		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
 		AC_SUBST(BRIDGE, "bridge")