diff --git a/cf b/cf
index 35390a486..5445eab8e 100644
--- a/cf
+++ b/cf
@@ -1,7 +1,7 @@
 #!/bin/bash
 #X="-x"
 
-#HDF5=1
+HDF5=1
 DAP=1
 #CDMR=1
 #RPC=1
diff --git a/ncdump/run_back_comp_tests.sh b/ncdump/run_back_comp_tests.sh
index 7a9dd9319..d3ce58af6 100755
--- a/ncdump/run_back_comp_tests.sh
+++ b/ncdump/run_back_comp_tests.sh
@@ -6,9 +6,12 @@ echo ""
 echo "*** Testing that this version can read data produced by old versions of netCDF."
 echo "*** checking ref_nc_test_netcdf4_4_0.nc..."
 ./ncdump $srcdir/ref_nc_test_netcdf4_4_0.nc > tst_nc_test_netcdf4_4_0.cdl
-tail -n +2 < $srcdir/ref_nc_test_netcdf4.cdl > tmp.cdl
-tail -n +2 < tst_nc_test_netcdf4_4_0.cdl > tmp_4_0.cdl
-diff -w tmp.cdl tmp_4_0.cdl
+# Why drop the first two lines?
+#tail -n +2 < $srcdir/ref_nc_test_netcdf4.cdl > tmp.cdl
+#tail -n +2 < tst_nc_test_netcdf4_4_0.cdl > tmp_4_0.cdl
+#diff -w tmp.cdl tmp_4_0.cdl
+diff -w $srcdir/ref_nc_test_netcdf4.cdl tst_nc_test_netcdf4_4_0.cdl
+
 
 # echo "*** Testing that old versions can read data produced by this version of netCDF."
 # echo "*** checking version 4.0..."