diff --git boost/chrono/io/time_point_io.hpp boost/chrono/io/time_point_io.hpp
index f129634..b85ac57 100644
--- boost/chrono/io/time_point_io.hpp
+++ boost/chrono/io/time_point_io.hpp
@@ -33,7 +33,8 @@
 #include <locale>
 #include <string.h>
 
-#define  BOOST_CHRONO_INTERNAL_TIMEGM defined BOOST_WINDOWS && ! defined(__CYGWIN__)
+#define  BOOST_CHRONO_INTERNAL_TIMEGM (defined BOOST_WINDOWS && ! defined(__CYGWIN__)) || \
+                                      ((defined(sun) || defined(__sun)) && defined __GNUC__)
 #define  BOOST_CHRONO_INTERNAL_GMTIME defined BOOST_WINDOWS && ! defined(__CYGWIN__)
 
 #define  BOOST_CHRONO_USES_INTERNAL_TIME_GET