add zos for death test support
diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index 4f0d89d..8820fbf 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -669,7 +669,7 @@
// Determines whether to support death tests.
// pops up a dialog window that cannot be suppressed programmatically.
#if (defined(GTEST_OS_LINUX) || defined(GTEST_OS_CYGWIN) || \
- defined(GTEST_OS_SOLARIS) || \
+ defined(GTEST_OS_SOLARIS) || defined(GTEST_OS_ZOS) || \
(defined(GTEST_OS_MAC) && !defined(GTEST_OS_IOS)) || \
(defined(GTEST_OS_WINDOWS_DESKTOP) && _MSC_VER) || \
defined(GTEST_OS_WINDOWS_MINGW) || defined(GTEST_OS_AIX) || \