Index: /mpich2/trunk/configure.in
===================================================================
--- /mpich2/trunk/configure.in (revision 4845)
+++ /mpich2/trunk/configure.in (revision 4896)
@@ -6317,6 +6317,8 @@
         ac_sub_configure_args="--prefix=$prefix $ac_sub_configure_args"
     
+    # The eval below is needed to properly quote the sub-configure arguments.
+    # Thanks to Steve Oyanagi at Cray for spotting it when it was missing.
     (cd src/binding/f90 && \
-    $master_top_srcdir/src/binding/f90/configure $ac_sub_configure_args )
+     eval $master_top_srcdir/src/binding/f90/configure $ac_sub_configure_args)
     rc=$?
     if test $rc = 0 ; then