From 9d52cfa9211743da2cdb2c1a8c9b82cea5aff2ab Mon Sep 17 00:00:00 2001
From: Felix Ruess <felix.ruess@gmail.com>
Date: Thu, 8 Aug 2013 00:22:13 +0200
Subject: [PATCH] [nps] only declare isnan on osx

---
 sw/simulator/nps/nps_fdm_jsbsim.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sw/simulator/nps/nps_fdm_jsbsim.c b/sw/simulator/nps/nps_fdm_jsbsim.c
index 4fccf4e4ea..c33307c82d 100644
--- a/sw/simulator/nps/nps_fdm_jsbsim.c
+++ b/sw/simulator/nps/nps_fdm_jsbsim.c
@@ -483,9 +483,11 @@ void lla_from_jsbsim_geodetic(LlaCoor_d* fdm_lla, FGPropagate* propagate) {
 
 }
 
-/* Why isn't this there when we include math.h? */
+#ifdef __APPLE__
+/* Why isn't this there when we include math.h (on osx with clang)? */
 /// Check if a double is NaN.
 static int isnan(double f) { return (f != f); }
+#endif
 
 /**
  * Checks NpsFdm struct for NaNs.