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diff --git a/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/cds/compiler/gcc/amd64/backoff.h b/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/cds/compiler/gcc/amd64/backoff.h
new file mode 100644
index 0000000..9896260
--- /dev/null
+++ b/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/cds/compiler/gcc/amd64/backoff.h
@@ -0,0 +1,60 @@
+/*
+    This file is a part of libcds - Concurrent Data Structures library
+
+    (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
+
+    Source code repo: http://github.com/khizmax/libcds/
+    Download: http://sourceforge.net/projects/libcds/files/
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice, this
+      list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CDSLIB_COMPILER_GCC_AMD64_BACKOFF_H
+#define CDSLIB_COMPILER_GCC_AMD64_BACKOFF_H
+
+//@cond none
+
+namespace cds { namespace backoff {
+    namespace gcc { namespace amd64 {
+
+#       define CDS_backoff_nop_defined
+        static inline void backoff_nop()
+        {
+            asm volatile ( "nop;" );
+        }
+
+#       define CDS_backoff_hint_defined
+        static inline void backoff_hint()
+        {
+            asm volatile ( "pause;" );
+        }
+
+
+    }} // namespace gcc::amd64
+
+    namespace platform {
+        using namespace gcc::amd64;
+    }
+}}  // namespace cds::backoff
+
+//@endcond
+#endif  // #ifndef CDSLIB_COMPILER_GCC_AMD64_BACKOFF_H