diff --git a/include/boost/config/platform/cygwin.hpp b/include/boost/config/platform/cygwin.hpp
index 6e77bb5b..1e2eb5ee 100644
--- a/include/boost/config/platform/cygwin.hpp
+++ b/include/boost/config/platform/cygwin.hpp
@@ -11,6 +11,7 @@
 #define BOOST_NO_CWCTYPE
 #define BOOST_NO_CWCHAR
 #define BOOST_NO_SWPRINTF
+#define BOOST_HAS_DIRENT_H
 
 //
 // Threading API:
diff --git a/include/boost/config/stdlib/dinkumware.hpp b/include/boost/config/stdlib/dinkumware.hpp
index a52b108c..bf44f1ba 100644
--- a/include/boost/config/stdlib/dinkumware.hpp
+++ b/include/boost/config/stdlib/dinkumware.hpp
@@ -21,7 +21,7 @@
 #  if !(defined(_GLOBAL_USING) && (_GLOBAL_USING+0 > 0)) && !defined(_STD)   // can be defined in yvals.h
 #     define BOOST_NO_STDC_NAMESPACE
 #  endif
-#  if !(defined(_HAS_MEMBER_TEMPLATES_REBIND) && (_HAS_MEMBER_TEMPLATES_REBIND+0 > 0)) && !(defined(_MSC_VER) && (_MSC_VER > 1300))
+#  if !(defined(_HAS_MEMBER_TEMPLATES_REBIND) && (_HAS_MEMBER_TEMPLATES_REBIND+0 > 0)) && !(defined(_MSC_VER) && (_MSC_VER > 1300)) && defined(BOOST_MSVC)
 #     define BOOST_NO_STD_ALLOCATOR
 #  endif
 #  if defined(_MSC_VER) && (_MSC_VER < 1300)