From a76ce042e649170a32ac663e7888992b94a89937 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 7 Oct 2010 18:09:15 +0200
Subject: MSVC for windows mobile does not have the errno.h file

---
 Eigen/Core                   | 7 +++++++
 Eigen/src/Core/util/Memory.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/Eigen/Core b/Eigen/Core
index a76d705b0..6951babd0 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -141,7 +141,14 @@
 #include <omp.h>
 #endif
 
+// MSVC for windows mobile does not have the errno.h file
+#if !(defined(_MSC_VER) && defined(_WIN32_WCE))
+#define EIGEN_HAS_ERRNO
+#endif
+
+#ifdef EIGEN_HAS_ERRNO
 #include <cerrno>
+#endif
 #include <cstdlib>
 #include <cmath>
 #include <complex>
diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 75c3e5ec4..362ccf18e 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -146,7 +146,9 @@ inline void* ei_generic_aligned_realloc(void* ptr, size_t size, size_t old_size)
   void* newptr = ei_aligned_malloc(size);
   if (newptr == 0)
   {
+    #ifdef EIGEN_HAS_ERRNO
     errno = ENOMEM; // according to the standard
+    #endif
     return 0;
   }
 
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