diff --git a/.travis.yml b/.travis.yml
index 97c3c454d..301c09d47 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,25 +11,25 @@ services:
 
 env:
     matrix:
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x64-signed
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x64-signed
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x86-signed
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x86-signed
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x64-signed
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x64-signed
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x86-signed
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x86-signed
 
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x64-unsigned
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x64-unsigned
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x86-unsigned
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x86-unsigned
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x64-unsigned
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x64-unsigned
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x86-unsigned
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-netcdf-4 --disable-dap-remote-tests --enable-cdf5' COPTS='-DENABLE_NETCDF_4=OFF -DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x86-unsigned
 
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x64-signed
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x64-signed
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x86-signed
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x86-signed
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x64-signed
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x64-signed
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x86-signed
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-fsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-fsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x86-signed
 
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x64-unsigned
-        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x64-unsigned
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-gcc-x86-unsigned
-        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF' CURHOST=docker-clang-x86-unsigned
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x64-unsigned
+        - DOCKIMG=unidata/nctests:serial   USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x64-unsigned
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=gcc   AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-gcc-x86-unsigned
+        - DOCKIMG=unidata/nctests:serial32 USECMAKE=TRUE USEAC=TRUE DISTCHECK=TRUE USE_CC=clang AC_COPTS='CFLAGS=-funsigned-char --disable-dap-remote-tests --enable-cdf5' COPTS='-DCMAKE_C_FLAGS=-funsigned-char -DENABLE_DAP_REMOTE_TESTS=OFF -DENABLE_CDF5=TRUE' CURHOST=docker-clang-x86-unsigned
 
 before_install:
     - docker pull $DOCKIMG > /dev/null