Fix build on amd64.

svn path=/head/; revision=130788

net/nam/Makefile

@@ -7,6 +7,7 @@
 
 PORTNAME=	nam
 PORTVERSION=	1.10
+PORTREVISION=	1
 CATEGORIES=	net
 MASTER_SITES=	http://www.isi.edu/nsnam/dist/
 DISTNAME=	nam-src-${PORTVERSION}

net/nam/files/patch-agent.h

@@ -0,0 +1,14 @@
+
+$FreeBSD$
+
+--- agent.h.orig
++++ agent.h
+@@ -70,7 +70,7 @@
+   inline double width()  {return width_;}
+   inline double height() {return height_;}
+   virtual void findClosestCornertoPoint(double x, double y, 
+-               double &corner_x, double &corner_y) const = NULL; 
++               double &corner_x, double &corner_y) const = 0; 
+   virtual void place(double x, double y);
+   void label(const char* name, int anchor);
+   void color(const char* name);