diff --git a/include/boost/system/detail/std_interoperability.hpp b/include/boost/system/detail/std_interoperability.hpp
index a6ec728..30a378f 100644
--- a/include/boost/system/detail/std_interoperability.hpp
+++ b/include/boost/system/detail/std_interoperability.hpp
@@ -66,7 +66,9 @@ public:
     virtual bool equivalent( const std::error_code & code, int condition ) const BOOST_NOEXCEPT;
 };
 
+#if !defined(__SUNPRO_CC) // trailing __global is not supported
 inline std::error_category const & to_std_category( boost::system::error_category const & cat ) BOOST_SYMBOL_VISIBLE;
+#endif
 
 struct cat_ptr_less
 {
diff --git a/include/boost/system/error_code.hpp b/include/boost/system/error_code.hpp
index 0881d64..df80592 100644
--- a/include/boost/system/error_code.hpp
+++ b/include/boost/system/error_code.hpp
@@ -355,7 +355,10 @@ constexpr error_category const & generic_category() BOOST_NOEXCEPT
 
 #else // #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
 
+#if !defined(__SUNPRO_CC) // trailing __global is not supported
 inline error_category const & system_category() BOOST_NOEXCEPT BOOST_SYMBOL_VISIBLE;
+inline error_category const & generic_category() BOOST_NOEXCEPT BOOST_SYMBOL_VISIBLE;
+#endif
 
 inline error_category const & system_category() BOOST_NOEXCEPT
 {
@@ -363,8 +366,6 @@ inline error_category const & system_category() BOOST_NOEXCEPT
     return system_category_instance;
 }
 
-inline error_category const & generic_category() BOOST_NOEXCEPT BOOST_SYMBOL_VISIBLE;
-
 inline error_category const & generic_category() BOOST_NOEXCEPT
 {
     static const detail::generic_error_category generic_category_instance;