+/* PERL_THREAD_LOCAL:
+ * This symbol, if defined, gives a linkage specification for thread-local
+ * storage. For example, for a C11 compiler this will be _Thread_local.
+ * Beware, some compilers are sensitive to the C language standard they are
+ * told to parse. For example, suncc defaults to C11, so our probe will
+ * report that _Thread_local can be used. However, if the -std=c99 is later
+ * added to the compiler flags, then _Thread_local will become a syntax
+ * error. Hence it is important for these flags to be consistent between
+ * probing and use.
+ */
+/*#define PERL_THREAD_LOCAL / **/
+