From c78a676e82eeb041e1491d297b140ba574762b22 Mon Sep 17 00:00:00 2001
From: "James E. King III" <jking@apache.org>
Date: Thu, 1 Nov 2018 14:27:59 -0400
Subject: [PATCH] Fix BOOST_NO_FENV_H on cygwin

---
 include/boost/config/platform/cygwin.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/boost/config/platform/cygwin.hpp b/include/boost/config/platform/cygwin.hpp
index 6dd7e57c..d0052d8b 100644
--- a/include/boost/config/platform/cygwin.hpp
+++ b/include/boost/config/platform/cygwin.hpp
@@ -42,8 +42,11 @@
 #   define BOOST_HAS_STDINT_H
 #endif
 
+#include <cygwin/version.h>
+#if (CYGWIN_VERSION_API_MAJOR == 0 && CYGWIN_VERSION_API_MINOR < 231)
 /// Cygwin has no fenv.h
 #define BOOST_NO_FENV_H
+#endif
 
 // Cygwin has it's own <pthread.h> which breaks <shared_mutex> unless the correct compiler flags are used:
 #ifndef BOOST_NO_CXX14_HDR_SHARED_MUTEX