diff --git a/llvm.spec b/llvm.spec
index e10de08..8ee1160 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -15,7 +15,7 @@
 
 Name:           llvm
 Version:        2.9
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        The Low Level Virtual Machine
 
 Group:          Development/Languages
@@ -342,14 +342,20 @@ find examples -name 'Makefile' | xargs -0r rm -f
 # the Koji build server does not seem to have enough RAM
 # for the default 16 threads
 
-# LLVM test suite failing on PPC64
-%ifnarch ppc64
-make check LIT_ARGS="-v -j4"
+# LLVM test suite failing on PPC64 and s390(x)
+make check LIT_ARGS="-v -j4" \
+%ifarch ppc64 s390 s390x
+ || :
+%else
+ %{nil}
 %endif
 
-# clang test suite failing on PPC
-%ifnarch ppc ppc64
-make -C tools/clang/test TESTARGS="-v -j4"
+# clang test suite failing on PPC and s390(x)
+make -C tools/clang/test TESTARGS="-v -j4" \
+%ifarch ppc ppc64 s390 s390x
+ || :
+%else
+ %{nil}
 %endif
 
 
@@ -466,6 +472,9 @@ exit 0
 
 
 %changelog
+* Tue Oct 11 2011 Dan Horák <dan[at]danny.cz> - 2.9-5
+- don't fail the build on failing tests on ppc(64) and s390(x)
+
 * Fri Sep 30 2011 Michel Salim <salimma@fedoraproject.org> - 2.9-4
 - Apply upstream patch for Operator.h C++0x incompatibility (# 737365)