Updated GIS install instructions to use placeholders for GIS library versions.

[brylie]

GEOS 3.4.2 reportedly does not work fully as expected. Bump GEOS recommended version to 3.6.2.

https://www.reddit.com/r/django/comments/8pim8i/how_do_i_request_an_edit_in_the_geodjango/

[timgraham]

Could you also bump the versions of the other packages on this page?

[claudep]

Shouldn't this snippet written with a placeholder (like <latest version>) instead of hardcoding a version number?

GEOS 3.4.2 reportedly does not work fully as expected

What's the issue?

[brylie]

Shouldn't this snippet written with a placeholder (like ) instead of hardcoding a version number?

That would seem like a reasonable idea. How could the latest-version be inserted into the tutorial? E.g. we could keep a list of latest version for the libraries, and the documentation pre-build script would insert their values throughout the article(s) where relevant.

[claudep]

Something like First, download a Django-supported GEOS archive from the GEOS website... and then a litteral <version> string in the lines below? I don't think inserting a real version number is worth the trouble.

[brylie]

Well, I think it is done so people can copy/paste the commands. That makes it easier to get started.

Another idea would be to maintain a basic installation script, so users could just run the script instead of a series of commands.

[claudep]

In my opinion, building from source is not for the faint-hearted, but for relatively experienced devs, that's why I think they are able to make the version replacement themselves.

[timgraham]

I'd be in favor of placeholders also.