--- tools/build/v2/tools/mpi.jam.orig	2010-06-07 13:18:29.000000000 -0400
+++ tools/build/v2/tools/mpi.jam	2011-01-15 20:36:14.000000000 -0500
@@ -373,7 +373,7 @@
         }
 
         # 
-        compile_flags = [ SHELL "$(command) -c -v 2>/dev/null" ] ;
+        compile_flags = [ SHELL "$(command) -F:xlC_r -c -v 2>/dev/null" ] ;
         compile_flags = [ MATCH "(.*)exec: export.*" : $(compile_flags) ] ;
         local front = [ MATCH "(.*)-v" :  $(compile_flags) ] ;
         local back = [ MATCH "-v(.*)" :  $(compile_flags) ] ;