From bf48c1ddbdc3c7c3eb7017a2ab9cab8409a3e3c0 Mon Sep 17 00:00:00 2001
From: Zachary Struck <zachstruck@gmail.com>
Date: Mon, 1 Aug 2016 19:51:07 -0400
Subject: [PATCH] Fix build error on VS 2015 with Clang/C2

Fixes #690 due to unknown type IUnknown in Windows.h header
---
 include/internal/catch_console_colour_impl.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/internal/catch_console_colour_impl.hpp b/include/internal/catch_console_colour_impl.hpp
index f776952b..315161c5 100644
--- a/include/internal/catch_console_colour_impl.hpp
+++ b/include/internal/catch_console_colour_impl.hpp
@@ -48,6 +48,7 @@ namespace Catch {
 #ifdef __AFXDLL
 #include <AfxWin.h>
 #else
+struct IUnknown;
 #include <windows.h>
 #endif