ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/system/api_config.hpp b/include/ndnboost/system/api_config.hpp
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+++ b/include/ndnboost/system/api_config.hpp
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+// ndnboost/system/api_config.hpp -------------------------------------------------------//
+
+// Copyright Beman Dawes 2003, 2006, 2010
+
+// Distributed under the Boost Software License, Version 1.0.
+// See http://www.boost.org/LICENSE_1_0.txt
+
+// See http://www.boost.org/libs/system for documentation.
+
+//--------------------------------------------------------------------------------------//
+
+// Boost.System calls operating system API functions to implement system error category
+// functions. Usually there is no question as to which API is to be used.
+//
+// In the case of MinGW or Cygwin/MinGW, however, both POSIX and Windows API's are
+// available. Chaos ensues if other code thinks one is in use when Boost.System was
+// actually built with the other. This header centralizes the API choice and prevents
+// user definition of API macros, thus elminating the possibility of mismatches and the
+// need to test configurations with little or no practical value.
+//
+
+//--------------------------------------------------------------------------------------//
+
+#ifndef NDNBOOST_SYSTEM_API_CONFIG_HPP
+#define NDNBOOST_SYSTEM_API_CONFIG_HPP
+
+# if defined(NDNBOOST_POSIX_API) || defined(NDNBOOST_WINDOWS_API)
+# error user defined NDNBOOST_POSIX_API or NDNBOOST_WINDOWS_API not supported
+# endif
+
+// NDNBOOST_POSIX_API or NDNBOOST_WINDOWS_API specify which API to use
+// Cygwin/MinGW does not predefine _WIN32.
+// Standalone MinGW and all other known Windows compilers do predefine _WIN32
+// Compilers that predefine _WIN32 or __MINGW32__ do so for Windows 64-bit builds too.
+
+# if defined(_WIN32) || defined(__CYGWIN__) // Windows default, including MinGW and Cygwin
+# define NDNBOOST_WINDOWS_API
+# else
+# define NDNBOOST_POSIX_API
+# endif
+
+#endif // NDNBOOST_SYSTEM_API_CONFIG_HPP