--- boost_1_57_0/libs/filesystem/src/operations.cpp	2014-10-29 10:34:00.000000000 -0500
+++ boost_1_57_0/libs/filesystem/src/operations.cpp	2015-05-04 23:30:34.278446000 -0500
@@ -1966,8 +1966,7 @@ namespace
   {
     errno = 0;
 
-#   if !defined(__CYGWIN__)\
-    && defined(_POSIX_THREAD_SAFE_FUNCTIONS)\
+#   if defined(_POSIX_THREAD_SAFE_FUNCTIONS)\
     && defined(_SC_THREAD_SAFE_FUNCTIONS)\
     && (_POSIX_THREAD_SAFE_FUNCTIONS+0 >= 0)\
     && (!defined(__hpux) || defined(_REENTRANT)) \
--- boost_1_57_0/libs/filesystem/src/path.cpp	2014-10-29 10:34:00.000000000 -0500
+++ boost_1_57_0/libs/filesystem/src/path.cpp	2015-05-04 17:45:45.582315200 -0500
@@ -36,7 +36,7 @@
 # include "windows_file_codecvt.hpp"
 # include <windows.h>
 #elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__) \
- || defined(__FreeBSD__) || defined(__OPEN_BSD__)
+ || defined(__FreeBSD__) || defined(__OPEN_BSD__) || defined(__CYGWIN__)
 # include <boost/filesystem/detail/utf8_codecvt_facet.hpp>
 #endif
 
@@ -831,7 +831,7 @@ namespace
     std::locale global_loc = std::locale();
     return std::locale(global_loc, new windows_file_codecvt);
 # elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__) \
-  || defined(__FreeBSD__) || defined(__OpenBSD__)
+  || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
     // "All BSD system functions expect their string parameters to be in UTF-8 encoding
     // and nothing else." See
     // http://developer.apple.com/mac/library/documentation/MacOSX/Conceptual/BPInternational/Articles/FileEncodings.html