+
+// Safer use of UnicodeString.
+#ifndef UNISTR_FROM_CHAR_EXPLICIT
+# define UNISTR_FROM_CHAR_EXPLICIT explicit
+#endif
+
+// Less important, but still a good idea.
+#ifndef UNISTR_FROM_STRING_EXPLICIT
+# define UNISTR_FROM_STRING_EXPLICIT explicit
+#endif
+