Index: src/util/default_locale.cpp
===================================================================
--- src/util/default_locale.cpp	(revision 85866)
+++ src/util/default_locale.cpp	(working copy)
@@ -29,6 +29,8 @@
             std::string get_system_locale(bool use_utf8)
             {
                 char const *lang = 0;
+                //WinRT applications don't have a notion of environment variables and getenv implementation
+                #ifndef BOOST_FOR_WINRT
                 if(!lang || !*lang)
                     lang = getenv("LC_CTYPE");
                 if(!lang || !*lang)
@@ -35,6 +37,7 @@
                     lang = getenv("LC_ALL");
                 if(!lang || !*lang)
                     lang = getenv("LANG");
+                #endif
                 #ifndef BOOST_LOCALE_USE_WIN32_API
                 (void)use_utf8; // not relevant for non-windows
                 if(!lang || !*lang)