add ninja prereqs

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Install Prereqs
       run: |
         sudo apt update -yq
-        sudo apt install -yq --no-install-recommends ninja-build gfortran
+        sudo apt install -yq --no-install-recommends gfortran
     - run: pip install .[tests,lint]
     - run: flake8
     - run: mypy .
@@ -37,7 +37,7 @@ jobs:
     - uses: actions/setup-python@v1
       with:
         python-version: '3.x'
-    - run: brew install gcc ninja
+    - run: brew install gcc
     - run: pip install .[tests]
     - run: pytest
       working-directory: tests
@@ -52,7 +52,6 @@ jobs:
     - uses: actions/setup-python@v1
       with:
         python-version: '3.x'
-    - run: cinst -y ninja
     - run: pip install .[tests]
     - run: pytest
       working-directory: tests

README.md

@@ -11,20 +11,13 @@
 ![image](./figures/iri2DExample02.gif)
 
 Python and [Matlab](#matlab) interfaces to the International Reference Ionosphere (IRI) 2016 model.
-A Fortran compiler and CMake or
-[Meson](https://github.com/mesonbuild/meson/)
-is required to build the IRI2016 code.
+A Fortran compiler is required to build the IRI2016 code.
 
 ## Install
 
 **Prerequisites**
 
 * Python >= 3.6
-* Ninja-build obtained by:
-  * Linux: `apt install ninja-build`
-  * MacOS/Homebrew: `brew install ninja`
-  * Windows Chocolatey: `cinst -y ninja`
-  * [direct download](https://github.com/ninja-build/ninja/releases) and extract, put directory in PATH environment variable.
 * Fortran compiler--just about any modern Fortran compiler will do. Here's how to get Gfortran:
   * Linux: `apt install gfortran`
   * Mac: `brew install gcc`
@@ -44,6 +37,10 @@ git clone https://github.com/space-physics/iri2016
 pip install -e iri2016
 ```
 
+This Python wrapper of IRI2016 uses our build-on-run technique.
+The first time you use IRI2016, you will see messages from the Meson build system and your C compiler.
+
+
 ## Usage
 
 * Altitude Profile: plot density and temperatures vs altitude
@@ -73,8 +70,9 @@ pip install -e iri2016
   ![image](./figures/iri2DExample02.png)
 
 ### Matlab / GNU Octave
+
 IRI2016 is readily accessible from Matlab and GNU Octave.
-From within Matlab/Octave, verify everything is working by from the `iri2016/tests` directory:
+From within Matlab / Octave, verify everything is working by from the `iri2016/tests` directory:
 
 ```matlab
 test_iri2016

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = iri2016
-version = 1.8.3
+version = 1.8.4
 author = Michael Hirsch, Ph.D.; Ronald Ilma
 author_email = scivision@users.noreply.github.com
 description = IRI2016 International Reference Ionosphere from Python
@@ -30,6 +30,7 @@ packages = find:
 zip_safe = false
 install_requires =
   meson
+  ninja
   python-dateutil
   numpy >= 1.10
   xarray