From 0af63493fdb12cea2fdfbabfbddbd4db44587047 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Tue, 20 Oct 2015 11:53:30 -0700
Subject: [PATCH] Disable SFINAE for versions of gcc older than 4.8

---
 unsupported/Eigen/CXX11/src/Tensor/TensorMacros.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorMacros.h b/unsupported/Eigen/CXX11/src/Tensor/TensorMacros.h
index 6d9cc4f38..939de5f11 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorMacros.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorMacros.h
@@ -26,8 +26,17 @@
  *   void foo(){}
  */
 
+// SFINAE requires variadic templates
 #ifdef EIGEN_HAS_VARIADIC_TEMPLATES
-#define EIGEN_HAS_SFINAE
+  // SFINAE doesn't work for gcc <= 4.7
+  #ifdef EIGEN_COMP_GNUC
+    #if EIGEN_GNUC_AT_LEAST(4,8)
+      #define EIGEN_HAS_SFINAE
+    #endif
+  #else
+    #define EIGEN_HAS_SFINAE
+  #endif
+
 #endif
 
 #define EIGEN_SFINAE_ENABLE_IF( __condition__ ) \