Attempting appveyor support. Based on work by @ocefpaf, see Unidata#347…

… for more information.

appveyor.yml

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+environment:
+  matrix:
+    - TARGET_ARCH: x64
+      CONDA_PY: 27
+      CONDA_INSTALL_LOCN: C:\\Miniconda-x64
+
+    - TARGET_ARCH: x64
+      CONDA_PY: 36
+      CONDA_INSTALL_LOCN: C:\\Miniconda35-x64
+
+platform:
+    - x64
+
+install:
+    # If there is a newer build queued for the same PR, cancel this one.
+    - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
+         https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
+         Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
+           throw "There are newer queued builds for this pull request, failing early." }
+
+    # Add path, activate conda, update conda, and add conda-forge channel for the dependencies.
+    - cmd: call %CONDA_INSTALL_LOCN%\Scripts\activate.bat
+    - cmd: conda config --set always_yes yes --set changeps1 no --set show_channel_urls true
+    - cmd: conda update conda
+    - cmd: conda config --add channels conda-forge --force
+    - cmd: set PYTHONUNBUFFERED=1
+
+    # Fix conda bug when building vc 9.
+    - cmd: conda install conda-build vs2008_express_vc_python_patch
+    - cmd: call setup_x64
+    # Debug info.
+    - cmd: conda info --all
+    - cmd: conda list
+
+# Skip .NET project specific build phase.
+build: off
+
+test_script:

conda.recipe/bld.bat

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+set PATH=%PATH%;C:\msys64\usr\bin
+
+mkdir %SRC_DIR%\build
+cd %SRC_DIR%\build
+
+cmake -G "Visual Studio 15 Win64" ^
+      -D CMAKE_INSTALL_PREFIX=%LIBRARY_PREFIX% ^
+      -D BUILD_SHARED_LIBS=ON ^
+      -D ENABLE_TESTS=ON ^
+      -D ENABLE_HDF4=ON ^
+      -D CMAKE_PREFIX_PATH=%LIBRARY_PREFIX% ^
+      -D ZLIB_LIBRARY=%LIBRARY_LIB%\zlib.lib ^
+      -D ZLIB_INCLUDE_DIR=%LIBRARY_INC% ^
+      -D CMAKE_BUILD_TYPE=Release ^
+      %SRC_DIR%
+if errorlevel 1 exit 1
+
+cmake --build . --config Release || exit 1
+
+ctest || exit 1
+
+nmake install || exit 1

conda.recipe/meta.yaml

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+
+{% set version = "dev" %}
+
+package:
+  name: netcdf-c
+  version: {{ version }}
+
+source:
+  path: ../
+
+build:
+  features:
+    - vc9  # [win and py27]
+    - vc14  # [win and py>=35]
+
+requirements:
+  build:
+    - python  # Here only to activate the `vc`s.
+    - msinttypes
+    - curl
+    - zlib 1.2.*
+    - hdf4
+    - hdf5 1.8.20
+    - vc 15  # [win and py>=35]
+  run:
+    - curl
+    - zlib 1.2.*
+    - hdf4
+    - hdf5 1.8.20
+    - vc 15  # [win and py>=35]
+
+test:
+  commands: