Index: generic/nsfInt.h
===================================================================
diff -u -r09b4bca7c8d5c44f6be0b2c04ebfcdb7a58fd5ae -r7e090d5c59743ecf7e8fd8d05d5130c5bce092db
--- generic/nsfInt.h	(.../nsfInt.h)	(revision 09b4bca7c8d5c44f6be0b2c04ebfcdb7a58fd5ae)
+++ generic/nsfInt.h	(.../nsfInt.h)	(revision 7e090d5c59743ecf7e8fd8d05d5130c5bce092db)
@@ -1295,4 +1295,11 @@
 #define vsnprintf _vsnprintf
 #endif
 
+/* There are six whitespace characters in Tcl, which serve as element
+   separators in string representations of Tcl lists. See tclUtil.c */
+
+#define NsfHasTclSpace(str) \
+  (strpbrk((str), " \t\n\r\v\f") != NULL)
+
+
 #endif /* _nsf_int_h_ */