diff -ru boost.orig/boost/rational.hpp boost/boost/rational.hpp
--- foo/misc/boost.orig/boost/rational.hpp	2015-01-29 15:06:21.000000000 +0100
+++ foo/misc/boost/boost/rational.hpp	2015-07-19 12:45:44.193897654 +0200
@@ -110,7 +110,7 @@
 {
 public:
     explicit bad_rational() : std::domain_error("bad rational: zero denominator") {}
-    explicit bad_rational( char const *what ) : std::domain_error( what ) {}
+    explicit bad_rational( char const *what_ ) : std::domain_error( what_ ) {}
 };
 
 template <typename IntType>