From d148bdedcd3f665aa713f5eec10fa1fb603160ce Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Wed, 9 Oct 2013 11:52:54 +0200
Subject: [PATCH] Fix MSVC build, no C99 so no round().

(Doesn't use SGMisc<T>::round, since Nasal is pure C)
---
 simgear/nasal/mathlib.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/simgear/nasal/mathlib.c b/simgear/nasal/mathlib.c
index fcf23e6e..b12bc830 100644
--- a/simgear/nasal/mathlib.c
+++ b/simgear/nasal/mathlib.c
@@ -159,8 +159,13 @@ static naRef f_round(naContext c, naRef me, int argc, naRef* args)
         naRuntimeError(c, "non numeric arguments to round()");
     if (naIsNil(b))
         b.num = 1.0;
-    
+
+#ifdef _MSC_VER // MSVC is not C99-compatible, no round() in math.h
+    double y = a.num / b.num;
+    double x = floor(y + 0.5);
+#else
     double x = round(a.num / b.num);
+#endif
     a.num = x * b.num;
     
     return VALIDATE(a);
-- 
2.39.5