/* Return 1 if the __typeof__ keyword works. This could be done by
'configure', but for now it's easier to do it by hand. */
-#if 2 <= __GNUC__ || defined __IBM__TYPEOF__ || 0x5110 <= __SUNPRO_C
+#if (2 <= __GNUC__ || defined __IBM__TYPEOF__ \
+ || (0x5110 <= __SUNPRO_C && !__STDC__))
# define _GL_HAVE___TYPEOF__ 1
#else
# define _GL_HAVE___TYPEOF__ 0