diff --git a/ghc.spec b/ghc.spec
index 98fa234..d0a7b2a 100644
--- a/ghc.spec
+++ b/ghc.spec
@@ -22,7 +22,7 @@
 
 Name: ghc
 Version: 6.10.2
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: Glasgow Haskell Compilation system
 # fedora ghc has only been bootstrapped on the following archs:
 ExclusiveArch: %{ix86} x86_64 ppc alpha
@@ -119,6 +119,12 @@ popd
 exit 0
 %endif
 
+%ifarch ppc
+echo "GhcUnregisterised=YES" >> mk/build.mk
+echo "GhcWithNativeCodeGen=NO" >> mk/build.mk
+echo "SplitObjs=NO" >> mk/build.mk
+%endif
+
 %if %{without prof}
 echo "GhcLibWays=%{?with_shared:dyn}" >> mk/build.mk
 %endif
@@ -277,6 +283,9 @@ fi
 %endif
 
 %changelog
+* Sat May  2 2009 Jens Petersen <petersen@redhat.com> - 6.10.2-5
+- try unregisterised ppc to see if that stops the segfaulting with runghc
+
 * Tue Apr 28 2009 Jens Petersen <petersen@redhat.com> - 6.10.2-4
 - add experimental bcond hscolour
 - add experimental support for building shared libraries (for ghc-6.11)