* which will be added to the content of the environment variable, e.g.
* "HOME/.mystuff/plugins:MYSTUFF_PLUGINS_PATH"
* @paths: (allow-none): one ore more directory paths (separated by ':' or ';' or ','),
* which will be added to the content of the environment variable, e.g.
* "HOME/.mystuff/plugins:MYSTUFF_PLUGINS_PATH"
* @paths: (allow-none): one ore more directory paths (separated by ':' or ';' or ','),