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diff --git a/gcc/testsuite/gcc.dg/builtins-config.h b/gcc/testsuite/gcc.dg/builtins-config.h
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index 00000000000..7e7d92fbaf5
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+++ b/gcc/testsuite/gcc.dg/builtins-config.h
@@ -0,0 +1,29 @@
+/* Copyright (C) 2003 Free Software Foundation.
+
+   Define macros useful in tests for bulitin functions.  */
+
+/* Define HAVE_C99_RUNTIME if the entire C99 runtime is available on
+   the target system.  The value of HAVE_C99_RUNTIME should be the
+   same as the value of TARGET_C99_FUNCTIONS in the GCC machine
+   description.  (Perhaps GCC should predefine a special macro
+   indicating whether or not TARGET_C99_FUNCTIONS is set, but it does
+   not presently do that.)  */
+
+#if defined(sun)
+/* Solaris doesn't have the entire C99 runtime.  */
+#else
+/* Newlib has the "f" variants of the math functions, but not the "l"
+   variants.  TARGET_C99_FUNCTIONS is only defined if all C99
+   functions are present.  Therefore, on systems using newlib, tests
+   of builtins will fail for both the "f" and the "l" variants, and we
+   should therefore not define HAVE_C99_RUNTIME.  Including <ctype.h>
+   gives us a way of seeing if _NEWLIB_VERSION is defined.  Including
+   <math.h> would work too, but the GLIBC math inlines cause us to
+   generate inferior code, which causes the test to fail, so it is
+   not safe to include <math.h>.  */
+#include <ctype.h>
+#ifdef _NEWLIB_VERSION
+#else
+#define HAVE_C99_RUNTIME
+#endif
+#endif