diff --git a/external/external_build.cmake b/external/external_build.cmake
index 0b07227..ae8d0e8 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -210,7 +210,7 @@ ELSE(INTERNAL_NETCDF)
   find_path(NETCDF_INCLUDE_PATH NAMES netcdf.h)
   find_path(NETCDFCPP_INCLUDE_PATH NAMES netcdfcpp.h netcdf)
   find_library(NETCDF_LIBRARY netcdf)
-  find_library(NETCDFCPP_LIBRARY NAMES netcdf_c++ netcdf_c++4)
+  find_library(NETCDFCPP_LIBRARY NAMES netcdf_c++4 netcdf_c++)
 
   SET(CONFIGURE_CPP_FLAGS "${CONFIGURE_CPP_FLAGS} -I${NETCDF_INCLUDE_PATH} -I${NETCDFCPP_INCLUDE_PATH}")          
 endif (INTERNAL_NETCDF)
diff --git a/python/cosmotool/smooth.py b/python/cosmotool/smooth.py
index 7c39a75..418ca5d 100644
--- a/python/cosmotool/smooth.py
+++ b/python/cosmotool/smooth.py
@@ -1,7 +1,11 @@
 from .config import install_prefix
 import subprocess
 import os
-from tempfile import TemporaryDirectory
+try:
+  from tempfile import TemporaryDirectory
+except:
+  from backports.tempfile import TemporaryDirectory
+
 import h5py as h5
 import numpy as np
 import weakref