$OpenBSD: patch-source_CollisionSet_cpp,v 1.1.1.1 2018/09/04 21:56:09 bcallah Exp $

Needs abs().

Index: source/CollisionSet.cpp
--- source/CollisionSet.cpp.orig
+++ source/CollisionSet.cpp
@@ -20,6 +20,7 @@ PARTICULAR PURPOSE.  See the GNU General Public Licens
 #include "Ship.h"
 
 #include <algorithm>
+#include <cstdlib>
 #include <numeric>
 #include <set>
 
