Committed for D. Guinier: The new env variable MPI_ROOT facilitate launch script creation. It is asked by customers who use BPS and LSF batch manager

This commit was SVN r24465.

contrib/dist/linux/openmpi.spec

@@ -514,6 +514,10 @@ if test -z "\`echo \$MANPATH | grep %{_mandir}\`"; then
     MANPATH=%{_mandir}:\${MANPATH}
     export MANPATH
 fi
+
+# MPI_ROOT
+MPI_ROOT=%{_prefix}
+export MPI_ROOT
 EOF
 cat <<EOF > $RPM_BUILD_ROOT/%{shell_scripts_path}/%{shell_scripts_basename}.csh
 # NOTE: This is an automatically-generated file!  (generated by the
@@ -542,6 +546,9 @@ if ("1" == "\$?MANPATH") then
 else
     setenv MANPATH %{_mandir}:
 endif
+
+# MPI_ROOT
+setenv MPI_ROOT %{_prefix}
 EOF
 %endif
 # End of shell_scripts if