--- lib/JAMA/tnt_math_utils.h~	2006-05-10 13:58:50.000000000 -0400
+++ lib/JAMA/tnt_math_utils.h	2011-01-29 22:34:16.000000000 -0500
@@ -19,6 +19,7 @@
 
 namespace TNT
 {
+template <class Real> Real abs(const Real &a);
 /**
 	@returns hypotenuse of real (non-complex) scalars a and b by 
 	avoiding underflow/overflow