diff -u gnuCurveFit.h.orig gnuCurveFit.h
--- gnuCurveFit.h.orig	Mon May 18 04:08:30 1998
+++ gnuCurveFit.h	Thu Oct 30 21:42:04 2003
@@ -23,6 +23,8 @@
 
 #include <string>
 
+using namespace std;
+
 #ifndef gnuCurveFit_included
 #define gnuCurveFit_included