diff --git a/include/boost/config/platform/irix.hpp b/include/boost/config/platform/irix.hpp
index 2a991d10..d137ffc3 100644
--- a/include/boost/config/platform/irix.hpp
+++ b/include/boost/config/platform/irix.hpp
@@ -10,8 +10,15 @@
 #define BOOST_PLATFORM "SGI Irix"
 
 #define BOOST_NO_SWPRINTF 
+//
+// these are not auto detected by POSIX feature tests:
+//
+#define BOOST_HAS_GETTIMEOFDAY
+#define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
+
 
 // boilerplate code:
 #define BOOST_HAS_UNISTD_H
 #include <boost/config/posix_features.hpp>
 
+