Diff of /math.c [5db991] .. [071273]  Maximize  Restore

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--- a/math.c
+++ b/math.c
@@ -52,7 +52,7 @@
 //------------------------- Some auxilliary math functions --------------------------------------------
 
 // atanh is not available on MSVC until Visual Studio 2012. Use the atanh routine from gsl.
-#if _MSC_VER < 1700
+#if defined _MSC_VER && _MSC_VER < 1700
 
 #define GSL_DBL_EPSILON        2.2204460492503131e-16
 #define GSL_SQRT_DBL_EPSILON   1.4901161193847656e-08