Left base folder: C:\boost\boost_1_47_0
Right base folder: C:\boost\boost_1_47_0_mod
--- libs\system\src\error_code.cpp	2011-01-11 13:49:15.000000000 -0700
+++ libs\system\src\error_code.cpp	2011-08-11 18:47:46.000000000 -0700
@@ -81,12 +81,13 @@
   //   -- Tru64 provides strerror_r only when compiled -pthread.
   //   -- VMS doesn't provide strerror_r, but on this platform, strerror is
   //      thread safe.
   # if defined(BOOST_WINDOWS_API) || defined(__hpux) || defined(__sun)\
      || (defined(__linux) && (!defined(__USE_XOPEN2K) || defined(BOOST_SYSTEM_USE_STRERROR)))\
      || (defined(__osf__) && !defined(_REENTRANT))\
+     || (defined(__INTEGRITY))\
      || (defined(__vms))\
      || (defined(__QNXNTO__))
       const char * c_str = std::strerror( ev );
       return  c_str
         ? std::string( c_str )
         : unknown_err;