--- old/src/share/vm/runtime/commandLineFlagConstraintsGC.hpp	2015-07-15 00:06:59.952868163 -0700
+++ new/src/share/vm/runtime/commandLineFlagConstraintsGC.hpp	2015-07-15 00:06:59.852868160 -0700
@@ -34,6 +34,8 @@
  * an appropriate error value.
  */
 
+Flag::Error YoungPLABSizeConstraintFunc(bool verbose, size_t* value);
+
 Flag::Error MinHeapFreeRatioConstraintFunc(bool verbose, uintx* value);
 Flag::Error MaxHeapFreeRatioConstraintFunc(bool verbose, uintx* value);