Customize install with EASTEREIG_USE_FPOLY.

  - The default not use fortran compiler

setup.py

@@ -1,14 +1,26 @@
 # -*- coding: utf-8 -*-
 import setuptools
+import os
 # Usefull to build f90 files
 from numpy.distutils.core import Extension, setup
 
 with open("README.md", "r") as fh:
     long_description = fh.read()
 
-# Define f90 module to include
-ext_fpoly = Extension(name='eastereig.fpoly.fpolyval',
-                      sources=['eastereig/fpoly/fpolyval.f90'])
+# Use env var to activate fpoly, defaut is false
+USE_FPOLY = os.getenv('EASTEREIG_USE_FPOLY', 'False').lower() in ('true', '1', 't')
+if USE_FPOLY:
+    # Define f90 module to include
+    ext_fpoly = Extension(name='eastereig.fpoly._fpolyval',
+                          sources=['eastereig/fpoly/fpolyval.f90'])
+    ext_modules = [ext_fpoly]
+    print('Use fortran fpoly submodule.', 'Set environnement variable:',
+          '`EASTEREIG_USE_FPOLY=False` to activate full python version.')
+else:
+    ext_modules = []
+    print('Use full python version. Set environnement variable:',
+          '`EASTEREIG_USE_FPOLY=True` to activate fortran version.')
+
 
 def _getversion():
     """ Get version from VERSION."""
@@ -37,7 +49,7 @@ def _getversion():
     # we can use find_packages() to automatically discover all subpackages
     packages=setuptools.find_packages(),
     # build f90 module
-    ext_modules=[ext_fpoly],
+    ext_modules=ext_modules,
     install_requires=['numpy',
                       'scipy',
                       'matplotlib'],