add boosty.h file

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diff --git a/src/boosty.h b/src/boosty.h
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+/*
+#  boosty.h copyright (C) 2011 don bright
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#ifndef boosty_h_
+#define boosty_h_
+
+/*
+ boosty is a wrapper around boost so that OpenSCAD can work with old
+ versions of boost found on popular versions of linux, circa early 2012.
+
+ design
+  hope that the user is compiling with boost>1.44 + filesystem v3
+  if not, fall back to older deprecated functions, and rely on regression
+  testing to find bugs. implement the minimum needed by OpenSCAD and no more.
+  in a few years, this file should be deleted as unnecessary.
+
+ see also
+  http://www.boost.org/doc/libs/1_48_0/libs/filesystem/v3/doc/index.htm
+  http://www.boost.org/doc/libs/1_42_0/libs/filesystem/doc/index.htm
+  include/boost/wave/util/filesystem_compatability.hpp
+
+*/
+
+#include <string>
+#include <boost/filesystem.hpp>
+namespace fs = boost::filesystem;
+
+namespace boosty {
+#if BOOST_VERSION >= 104600 && BOOST_FILESYSTEM_VERSION >= 3
+inline bool is_absolute( fs::path p ) { return p.is_absolute(); }
+inline fs::path absolute( fs::path p ) { return fs::absolute( p ); }
+inline std::string stringy( fs::path p ) { return p.generic_string(); }
+inline std::string extension_str( fs::path p) { return p.extension().generic_string(); }
+#else
+inline bool is_absolute( fs::path p ) { return p.is_complete(); }
+inline fs::path absolute( fs::path p ) { return fs::complete( p ); }
+inline std::string stringy( fs::path p ) { return p.string(); }
+inline std::string extension_str( fs::path p) { return p.extension(); }
+#endif
+
+} // namespace
+
+#endif