diff -ru boost_1_46_0_ref//libs/filesystem/v3/src/path.cpp boost_1_46_0//libs/filesystem/v3/src/path.cpp
--- boost_1_46_0_ref//libs/filesystem/v3/src/path.cpp	2010-10-16 15:09:25.000000000 +0200
+++ boost_1_46_0//libs/filesystem/v3/src/path.cpp	2011-03-10 16:45:00.198210999 +0200
@@ -29,12 +29,13 @@
 #include <boost/assert.hpp>
 #include <cstddef>
 #include <cstring>
+#include <cstdlib>
 #include <cassert>
 
 #ifdef BOOST_WINDOWS_API
 # include "windows_file_codecvt.hpp"
 # include <windows.h>
-#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+#else
 # include <boost/filesystem/detail/utf8_codecvt_facet.hpp>
 #endif
 
@@ -733,8 +734,17 @@
 
   std::locale default_locale()
   {
-#   ifdef BOOST_WINDOWS_API
+    try {
+        // Best try use standard library's  locale
+        // support if avalible
+        return std::locale("");
+    }
+    catch(std::exception const &/*error*/) {
+        // Not supported, GCC on non-Linux for example
+    }
     std::locale global_loc = std::locale();
+
+#   ifdef BOOST_WINDOWS_API
     std::locale loc(global_loc, new windows_file_codecvt);
     return loc;
 
@@ -754,13 +764,39 @@
     // cases." http://lists.apple.com/archives/applescript-users/2002/Sep/msg00319.html
     //
     // Many thanks to Peter Dimov for digging out the above references!
-    std::locale global_loc = std::locale();
     std::locale loc(global_loc, new boost::filesystem::detail::utf8_codecvt_facet);
     return loc;
 
 #   else
-    // ISO C calls this "the locale-specific native environment":
-    return std::locale("");
+   
+    // Get default OS encoding 
+    char const *plang = getenv("LC_CTYPE");
+    if(!plang)
+        plang = getenv("LC_ALL");
+    if(!plang)
+        plang = getenv("LANG");
+    if(!plang)
+        return global_loc;
+    
+    std::string lang = plang;
+    size_t charset_start = lang.find('.');
+    if(charset_start == std::string::npos)
+        return global_loc;
+    charset_start ++;
+    size_t end_of_charset = lang.find(charset_start,'@');
+    std::string encoding = lang.substr(charset_start,end_of_charset - charset_start);
+    for(size_t i=0;i<encoding.size();i++) {
+        if('a' <= encoding[i] && encoding[i]<='z') {
+            encoding[i]=encoding[i]-'a' + 'A';
+        }
+    }
+    //
+    // Support at least the most popular and widely used encoding
+    //
+    if(encoding!="UTF-8" && encoding!="UTF8")
+    	return global_loc;
+    std::locale loc(global_loc, new boost::filesystem::detail::utf8_codecvt_facet);
+    return loc;
 
 #   endif
   }