diff --git a/cmake/modules/platform/os/zos.cmake b/cmake/modules/platform/os/zos.cmake
index 76f7de5746..179bc9be48 100644
--- a/cmake/modules/platform/os/zos.cmake
+++ b/cmake/modules/platform/os/zos.cmake
@@ -21,7 +21,7 @@
 
 list(APPEND OMR_PLATFORM_DEFINITIONS
 	-D_ALL_SOURCE
-	-D_OPEN_THREADS=2
+	-D_OPEN_THREADS=3
 	-D_POSIX_SOURCE
 	-D_XOPEN_SOURCE_EXTENDED
 	-D_ISOC99_SOURCE
diff --git a/cmake/modules/platform/toolcfg/zos_rename_exports.cmake b/cmake/modules/platform/toolcfg/zos_rename_exports.cmake
index d6556493fb..614030dbf1 100644
--- a/cmake/modules/platform/toolcfg/zos_rename_exports.cmake
+++ b/cmake/modules/platform/toolcfg/zos_rename_exports.cmake
@@ -37,7 +37,7 @@ if(NOT ARCHIVE_DIR)
 	set(ARCHIVE_DIR ${RUNTIME_DIR})
 endif()
 
-if(NOT EXISTS "${ARCHVIVE_DIR}")
+if(NOT EXISTS "${ARCHIVE_DIR}")
 	file(MAKE_DIRECTORY "${ARCHIVE_DIR}")
 endif()
 string(FIND "${LIBRARY_FILE_NAME}" "." dot_pos REVERSE)
@@ -45,11 +45,12 @@ string(SUBSTRING "${LIBRARY_FILE_NAME}" 0 ${dot_pos} base_name)
 
 set(SRC_FILE "${CMAKE_BINARY_DIR}/${base_name}.x")
 set(DEST_FILE "${ARCHIVE_DIR}/${base_name}.x")
-if(NOT "${SRC_FILE}" STREQUAL "${DEST_FILE}")
+
+if(EXISTS ${SRC_FILE} AND NOT "${SRC_FILE}" STREQUAL "${DEST_FILE}")
 	file(RENAME "${SRC_FILE}" "${DEST_FILE}")
 endif()
 
 # Work around a bug in CMake where it looks for .x files in the runime dir rather than the archive dir.
-if(NOT "${ARCHIVE_DIR}" STREQUAL "${RUNTIME_DIR}")
+if(EXISTS ${DEST_FILE} AND NOT "${ARCHIVE_DIR}" STREQUAL "${RUNTIME_DIR}")
 	file(COPY "${DEST_FILE}" DESTINATION "${RUNTIME_DIR}")
 endif()
diff --git a/fvtest/omrGtestGlue/CMakeLists.txt b/fvtest/omrGtestGlue/CMakeLists.txt
index d01af32ec2..18b26ca7f8 100644
--- a/fvtest/omrGtestGlue/CMakeLists.txt
+++ b/fvtest/omrGtestGlue/CMakeLists.txt
@@ -66,8 +66,13 @@ endif()
 if(OMR_OS_AIX OR OMR_OS_ZOS)
 	list(APPEND OMR_GTEST_DEFINITIONS
 		-DGTEST_ENV_HAS_STD_TUPLE_
-		-D__IBMCPP_TR1__
 	)
+
+	if(NOT OMR_TOOLCONFIG STREQUAL "openxl")
+		list(APPEND OMR_GTEST_DEFINITIONS
+			-D__IBMCPP_TR1__
+		)
+	endif()
 endif()
 
 target_compile_options(omrGtest
diff --git a/fvtest/porttest/omrvmemTest.cpp b/fvtest/porttest/omrvmemTest.cpp
index 1704e6f36a..c31b373f4e 100644
--- a/fvtest/porttest/omrvmemTest.cpp
+++ b/fvtest/porttest/omrvmemTest.cpp
@@ -265,6 +265,7 @@ isNewPageSize(uintptr_t pageSize, uintptr_t pageFlags)
  * On z/OS, 1M fixed and 2G fixed pages can be used only to allocate above 2G bar.
  * Only 4K and 1M pageable pages can be used to allocate memory below the bar.
  */
+BOOLEAN
 isPageSizeSupportedBelowBar(uintptr_t pageSize, uintptr_t pageFlags)
 {
 	if ((FOUR_KB == pageSize) ||
diff --git a/fvtest/sigtest/sigTest.cpp b/fvtest/sigtest/sigTest.cpp
index 244309fdf5..25b08e8bd6 100644
--- a/fvtest/sigtest/sigTest.cpp
+++ b/fvtest/sigtest/sigTest.cpp
@@ -20,7 +20,7 @@
  *******************************************************************************/
 
 #if defined(J9ZOS390)
-#define _OPEN_THREADS 2
+#define _OPEN_THREADS 3
 #define _UNIX03_SOURCE
 #endif /* defined(J9ZOS390) */
 
diff --git a/omrsigcompat/omrsig.cpp b/omrsigcompat/omrsig.cpp
index ac4b153453..194d0b4df8 100644
--- a/omrsigcompat/omrsig.cpp
+++ b/omrsigcompat/omrsig.cpp
@@ -21,7 +21,7 @@
  *******************************************************************************/
 
 #if defined(J9ZOS390)
-#define _OPEN_THREADS 2
+#define _OPEN_THREADS 3
 #define _UNIX03_SOURCE
 #endif /* defined(J9ZOS390) */
 
diff --git a/third_party/gtest-1.8.0/include/gtest/internal/gtest-port.h b/third_party/gtest-1.8.0/include/gtest/internal/gtest-port.h
index 79559f29b2..2489d2f2a9 100644
--- a/third_party/gtest-1.8.0/include/gtest/internal/gtest-port.h
+++ b/third_party/gtest-1.8.0/include/gtest/internal/gtest-port.h
@@ -478,7 +478,7 @@ struct _RTL_CRITICAL_SECTION;
 // detecting whether they are enabled or not.  Therefore, we assume that
 // they are enabled unless the user tells us otherwise.
 #  define GTEST_HAS_EXCEPTIONS 1
-# elif defined(__IBMCPP__) && __EXCEPTIONS
+# elif (defined(__IBMCPP__) || (defined(__open_xl__) && defined(__cplusplus))) && __EXCEPTIONS
 // xlC defines __EXCEPTIONS to 1 iff exceptions are enabled.
 #  define GTEST_HAS_EXCEPTIONS 1
 # elif defined(__HP_aCC)
@@ -570,7 +570,7 @@ struct _RTL_CRITICAL_SECTION;
 
 // Starting with version 9.0 IBM Visual Age defines __RTTI_ALL__ to 1 if
 // both the typeid and dynamic_cast features are present.
-# elif defined(__IBMCPP__) && (__IBMCPP__ >= 900)
+# elif (defined(__IBMCPP__) && (__IBMCPP__ >= 900)) || (defined(__open_xl__) && defined(__cplusplus))
 
 #  ifdef __RTTI_ALL__
 #   define GTEST_HAS_RTTI 1
@@ -690,11 +690,11 @@ struct _RTL_CRITICAL_SECTION;
 # elif GTEST_ENV_HAS_STD_TUPLE_
 #  include <tuple>
 
-#if defined(J9ZOS390) || defined(AIXPPC)
+#if (defined(J9ZOS390) && !defined(__open_xl__)) || defined(AIXPPC)
 // On z/OS and AIX, tuple is defined in the ::std::tr1 namespace as it is an
 // extension class since xlc does not support the full C++11 standard. As such,
 // we expose the tuple class in the ::std namespace such that code below will
-// work.
+// work. However, Open XL does support C++11 standard.
 namespace std
 {
 using ::std::tr1::get;
@@ -821,7 +821,7 @@ using ::std::tuple_size;
 // Typed tests need <typeinfo> and variadic macros, which GCC, VC++ 8.0,
 // Sun Pro CC, IBM Visual Age, and HP aCC support.
 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__SUNPRO_CC) || \
-    defined(__IBMCPP__) || defined(__HP_aCC)
+    defined(__IBMCPP__) || defined(__HP_aCC) || (defined(__open_xl__) && defined(__cplusplus))
 # define GTEST_HAS_TYPED_TEST 1
 # define GTEST_HAS_TYPED_TEST_P 1
 #endif
@@ -2200,7 +2200,7 @@ GTEST_API_ size_t GetThreadCount();
 // for objects passed through ellipsis (...), failing for uncopyable
 // objects.  We define this to ensure that only POD is passed through
 // ellipsis on these systems.
-#if defined(__SYMBIAN32__) || defined(__IBMCPP__) || defined(__SUNPRO_CC)
+#if defined(__SYMBIAN32__) || defined(__IBMCPP__) || defined(__SUNPRO_CC) || (defined(__open_xl__) && defined(__cplusplus))
 // We lose support for NULL detection where the compiler doesn't like
 // passing non-POD classes through ellipsis (...).
 # define GTEST_ELLIPSIS_NEEDS_POD_ 1
@@ -2212,7 +2212,7 @@ GTEST_API_ size_t GetThreadCount();
 // const T& and const T* in a function template.  These compilers
 // _can_ decide between class template specializations for T and T*,
 // so a tr1::type_traits-like is_pointer works.
-#if defined(__SYMBIAN32__) || defined(__IBMCPP__)
+#if defined(__SYMBIAN32__) || defined(__IBMCPP__) || (defined(__open_xl__) && defined(__cplusplus))
 # define GTEST_NEEDS_IS_POINTER_ 1
 #endif