Corrections on setup file

setup.py

@@ -38,7 +38,8 @@ include_dirs = ['Include']
 
 python_version = 'python%d.%d' % sys.version_info[:2]
 
-netcdf_h_search_paths = [os.path.join(sys.prefix,'include','Scientific'),
+netcdf_h_search_paths = [os.environ.get('NETCDF_HEADER_FILE_PATH'),
+                         os.path.join(sys.prefix,'include','Scientific'),
                          os.path.join(sys.prefix,'include',python_version,'Scientific'),
                          os.path.join(sys.prefix,'local','include',python_version,'Scientific')]
 
@@ -52,7 +53,8 @@ for path in netcdf_h_search_paths:
         break
 
 if netcdf_h is None:
-    raise FileError("No suitable NetCDF header found.")
+    print("/!\ No suitable NetCDF header found.")
+    sys.exit(1)
 
 compile_args.append("-DNUMPY=1")
 import numpy.distutils.misc_util