diff --git a/dyninst.spec b/dyninst.spec
index 9fc6236..1f88ede 100644
--- a/dyninst.spec
+++ b/dyninst.spec
@@ -13,6 +13,8 @@ ExclusiveArch: %{ix86} x86_64 ppc ppc64
 Source0: https://github.com/dyninst/dyninst/archive/v%{version}/dyninst-%{version}.tar.gz
 Source1: https://github.com/dyninst/testsuite/archive/v%{version}/testsuite-%{version}.tar.gz
 
+Patch1: testsuite-9.3.0-junit-nullptr.patch
+
 %global dyninst_base dyninst-%{version}
 %global testsuite_base testsuite-%{version}
 
@@ -83,6 +85,13 @@ making sure that dyninst works properly.
 %setup -q -n %{name}-%{version} -c
 %setup -q -T -D -a 1
 
+%patch1 -p0 -b.nullptr
+
+# cotire seems to cause non-deterministic gcc errors
+# https://bugzilla.redhat.com/show_bug.cgi?id=1420551
+sed -i.cotire -e 's/USE_COTIRE true/USE_COTIRE false/' \
+  %{dyninst_base}/cmake/shared.cmake
+
 %build
 
 cd %{dyninst_base}
diff --git a/testsuite-9.3.0-junit-nullptr.patch b/testsuite-9.3.0-junit-nullptr.patch
new file mode 100644
index 0000000..6f055c3
--- /dev/null
+++ b/testsuite-9.3.0-junit-nullptr.patch
@@ -0,0 +1,11 @@
+--- testsuite-9.3.0/src/JUnitOutputDriver.cpp.nullptr	2016-12-19 14:55:38.000000000 -0800
++++ testsuite-9.3.0/src/JUnitOutputDriver.cpp	2017-02-15 11:19:22.628056889 -0800
+@@ -35,7 +35,7 @@ void JUnitOutputDriver::startNewTest(std
+         {
+             std::stringstream suitename;
+             suitename << last_group->modname;
+-            if(last_group->mutatee != '\0') suitename << "." << last_group->mutatee;
++            if(last_group->mutatee != nullptr) suitename << "." << last_group->mutatee;
+             log(HUMAN, "<testsuite name=\"%s\" errors=\"%d\" skipped=\"%d\" tests=\"%d\" failures=\"%d\">\n",
+                 suitename.str().c_str(), group_errors, group_skips, group_tests, group_failures);
+             log(HUMAN, group_output.str().c_str());