Fix portability problems with glibc 2.0, as reported in #449157.
diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index 3f11054..7f7bdd2 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -527,6 +527,8 @@
     ADDINT(ABMON_11);
     ADDINT(ABMON_12);
 
+#ifdef RADIXCHAR
+    /* The following are not available with glibc 2.0 */
     ADDINT(RADIXCHAR);
     ADDINT(THOUSEP);
     /* YESSTR and NOSTR are deprecated in glibc, since they are
@@ -537,6 +539,7 @@
     ADDINT(NOSTR);
     */
     ADDINT(CRNCYSTR);
+#endif
 
     ADDINT(D_T_FMT);
     ADDINT(D_FMT);