diff --git a/m4/nc_cxx.m4 b/m4/nc_cxx.m4
index 7e675ab3..f4d7f91a 100644
--- a/m4/nc_cxx.m4
+++ b/m4/nc_cxx.m4
@@ -1,10 +1,12 @@
 AC_DEFUN([NC_CXX],[
     AX_CHECK_COMPILE_FLAG(
-        [-std=c++1y],
-        [AX_APPEND_FLAG([-std=c++1y], [CXXFLAGS])],
+        [-std=c++1z],
+        [AX_APPEND_FLAG([-std=c++1z], [CXXFLAGS])],
         [AC_ERROR([Unable to enable c++1y])]
     )
 
+    AX_APPEND_COMPILE_FLAGS([-pipe], [], [-Werror])
+
     AX_APPEND_COMPILE_FLAGS([-fno-deduce-init-list], [], [-Werror])
     AX_APPEND_COMPILE_FLAGS([-fno-deduce-init-list], [], [-Werror])