diff --git a/boost.spec b/boost.spec
index a1377c0..bdcec01 100644
--- a/boost.spec
+++ b/boost.spec
@@ -11,7 +11,11 @@
 %endif
 
 # Configuration of MPI backends
-%bcond_without mpich2
+%ifarch %{arm}
+  %bcond_with mpich2
+%else
+  %bcond_without mpich2
+%endif
 %ifarch s390 s390x %{arm}
   # No OpenMPI support on these arches
   %bcond_with openmpi
@@ -23,7 +27,7 @@ Name: boost
 Summary: The free peer-reviewed portable C++ source libraries
 Version: 1.46.1
 %define version_enc 1_46_1
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: Boost
 
 # The CMake build framework (set of CMakeLists.txt and module.cmake files) is
@@ -839,6 +843,9 @@ find $RPM_BUILD_ROOT%{_includedir}/ \( -name '*.pl' -o -name '*.sh' \) -exec %{_
 %{_bindir}/bjam
 
 %changelog
+* Sat Jun 18 2011 Peter Robinson <pbrobinson@gmail.com> - 1.46.1-4
+- Fix compile on ARM platforms
+
 * Mon Apr  4 2011 Petr Machata <pmachata@redhat.com> - 1.46.1-3
 - Yet another way to pass -DBOOST_LIB_INSTALL_DIR to cmake.  Passing
   via CMAKE_CXX_FLAGS for some reason breaks when rpm re-quotes the