Also include Engines sub-directories (issue JSBSim-Team#687).

python/setup.py.in

@@ -214,13 +214,15 @@ for d in os.scandir('data/aircraft'):
         data_files.append(('share/${PROJECT_NAME}/'+dir_name,
                             list(XML_files(dir_name))))
 
-        # Some aircraft folders include a `Systems` sub-directory: make sure it
-        # is copied in the wheel archive.
-        systems_dir = dir_name + '/Systems'
-        systems_dir_fullname = os.path.join('data', systems_dir)
-        if os.path.exists(systems_dir_fullname) and os.path.isdir(systems_dir_fullname):
-            data_files.append(('share/${PROJECT_NAME}/'+systems_dir,
-                                list(XML_files(systems_dir))))
+        # Some aircraft folders include a `Systems` and/or an `Engines`
+        # sub-directory so make sure it is copied in the wheel archive
+        # (see GH issue #687)
+        for sub_dir in ('Systems', 'Engines'):
+            sub_dir_name = dir_name + '/' + sub_dir
+            subdir_dir_fullname = os.path.join('data', sub_dir_name)
+            if os.path.exists(subdir_dir_fullname) and os.path.isdir(subdir_dir_fullname):
+                data_files.append(('share/${PROJECT_NAME}/'+sub_dir_name,
+                                    list(XML_files(sub_dir_name))))
 
 # Build & installation process for the JSBSim Python module
 setup(