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+// (C) Copyright John Maddock 2003.
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+#ifndef BOOST_CONFIG_REQUIRES_THREADS_H
+#define BOOST_CONFIG_REQUIRES_THREADS_H
+
+#ifndef BOOST_CONFIG_H
+# include <boost/config.hpp>
+#endif
+
+#if defined(BOOST_DISABLE_THREADS)
+
+//
+// special case to handle versions of gcc which don't currently support threads:
+//
+#if defined(__GNUC__) && ((__GNUC__ < 3) || (__GNUC_MINOR__ <= 3) || !defined(BOOST_STRICT_CONFIG))
+//
+// this is checked up to gcc 3.3:
+//
+#if defined(__sgi) || defined(__hpux)
+# error "Multi-threaded programs are not supported by gcc on HPUX or Irix (last checked with gcc 3.3)"
+#endif
+
+#endif
+
+# error "Threading support unavaliable: it has been explicitly disabled with BOOST_DISABLE_THREADS"
+
+#elif !defined(BOOST_HAS_THREADS)
+
+# if defined __COMO__
+// Comeau C++
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -D_MT (Windows) or -D_REENTRANT (Unix)"
+
+#elif defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)
+// Intel
+#ifdef _WIN32
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: either /MT /MTd /MD or /MDd"
+#else
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -openmp"
+#endif
+
+# elif defined __GNUC__
+// GNU C++:
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)"
+
+#elif defined __sgi
+// SGI MIPSpro C++
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -D_SGI_MP_SOURCE"
+
+#elif defined __DECCXX
+// Compaq Tru64 Unix cxx
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread"
+
+#elif defined __BORLANDC__
+// Borland
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -tWM"
+
+#elif defined __MWERKS__
+// Metrowerks CodeWarrior
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: either -runtime sm, -runtime smd, -runtime dm, or -runtime dmd"
+
+#elif defined __SUNPRO_CC
+// Sun Workshop Compiler C++
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -mt"
+
+#elif defined __HP_aCC
+// HP aCC
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: -mt"
+
+#elif defined(__IBMCPP__)
+// IBM Visual Age
+# error "Compiler threading support is not turned on. Please compile the code with the xlC_r compiler"
+
+#elif defined _MSC_VER
+// Microsoft Visual C++
+//
+// Must remain the last #elif since some other vendors (Metrowerks, for
+// example) also #define _MSC_VER
+# error "Compiler threading support is not turned on. Please set the correct command line options for threading: either /MT /MTd /MD or /MDd"
+
+#else
+
+# error "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use"
+
+#endif // compilers
+
+#endif // BOOST_HAS_THREADS
+
+#endif // BOOST_CONFIG_REQUIRES_THREADS_H