--- tools/build/v2/tools/gcc.jam.orig	2010-11-02 10:37:32.981384977 +0000
+++ tools/build/v2/tools/gcc.jam	2010-11-02 10:38:09.517384992 +0000
@@ -359,6 +359,17 @@
                 option = -maix64 ;
             }
         }
+        else if $(os) = hpux
+        {
+            if $(model) = 32
+            {
+                option = -milp32 ;
+            }
+            else
+            {
+                option = -mlp64 ;
+            }
+        }
         else
         {
             if $(model) = 32