1 files changed, 15 insertions, 0 deletions
diff --git a/src/mesa/main/querymatrix.c b/src/mesa/main/querymatrix.c
index 82b6fe7ab9..a0969f6b9f 100644
--- a/src/mesa/main/querymatrix.c
+++ b/src/mesa/main/querymatrix.c
@@ -69,6 +69,21 @@ fpclassify(double x)
             return FP_NAN;
     }
 }
+
+#elif defined(__APPLE__) || defined(__CYGWIN__) || defined(__FreeBSD__) || \
+     defined(__DragonFly__) || (defined(__sun) && defined(__C99FEATURES__))
+
+/* fpclassify is available. */
+
+#elif !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600
+
+enum {FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL}
+fpclassify(double x)
+{
+   /* XXX do something better someday */
+   return FP_NORMAL;
+}
+
 #endif
 
 extern GLbitfield GL_APIENTRY _es_QueryMatrixxOES(GLfixed mantissa[16], GLint exponent[16]);