Author: Niall Creech <niallcreech@gmail.com>
Description: Some systems define an enumeration containing R0 in
 sys/ucontext.h. Changing the name avoids any conflict.
Ubuntu-Bug: https://bugs.edge.launchpad.net/ubuntu/+source/predict/+bug/645036 
Index: predict-2.2.3/clients/earthtrack/earthtrack.c
===================================================================
--- predict-2.2.3.orig/clients/earthtrack/earthtrack.c	2010-09-22 10:16:02.148625844 +0100
+++ predict-2.2.3/clients/earthtrack/earthtrack.c	2010-09-22 10:16:45.895235838 +0100
@@ -49,7 +49,7 @@
 #endif
 
 char	string[625], error;
-double	R0=6378.16, TWOPI=6.283185307179586,
+double	LOCAL_R0=6378.16, TWOPI=6.283185307179586,
 	HALFPI=1.570796326794896, deg2rad=1.74532925199e-02;
 FILE	*markerfd=NULL, *greatarcfd=NULL;
 
@@ -259,7 +259,7 @@
 
 	ssplat=ssplat*deg2rad;
 	ssplong=ssplong*deg2rad;
-	beta=(0.5*footprint)/R0;
+	beta=(0.5*footprint)/LOCAL_R0;
 
 	for (azi=0; azi<360; azi++)
 	{
@@ -570,7 +570,7 @@
 				circledrawn=1;
 
 				if (zoom)
-					radius=(int)(100.0*(R0/footprint));
+					radius=(int)(100.0*(LOCAL_R0/footprint));
 				else
 					radius=50;