From 90a07713c01840cdbd28d3a9770866fe2ce23136 Mon Sep 17 00:00:00 2001
From: Wil Shipley <wjs@delicious-monster.com>
Date: Wed, 11 Mar 2015 16:55:21 -0700
Subject: [PATCH] Added 'const' to () operator on CompareVector

So it can build on clang.
---
 code/IFCUtil.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/IFCUtil.cpp b/code/IFCUtil.cpp
index 6fcda33c7..800ffd3ed 100644
--- a/code/IFCUtil.cpp
+++ b/code/IFCUtil.cpp
@@ -236,7 +236,7 @@ IfcVector3 TempMesh::ComputeLastPolygonNormal(bool normalize) const
 
 struct CompareVector
 {
-	bool operator () (const IfcVector3& a, const IfcVector3& b)
+	bool operator () (const IfcVector3& a, const IfcVector3& b) const
 	{
 		IfcVector3 d = a - b;
 		IfcFloat eps = 1e-6;