I tried to reply to my own post on the topic but my browser wasn't compatible with this website I guess and it would not give me any place to type a reply...!

So here's the story.

Allegro 5.1.11 (and some earlier versions) simply checked for XInput2 2.2 during configure by trying to compile a sample program that used XI_TouchBegin. If that sample program failed then it gave the error that X11 required XInput2 2.2.

By way of background, XInput2 2.2 is required when you need touch screen functionality or something like that. XInput is a library that is (as I understand it) directly tied to the version of xwindows you have. In order to upgrade your XInput version, you'd have to upgrade all of X11, which could be quite a task.

I'm using slackware 13.37 (released 2011) and it had an older version of X11 which does not support the touch extensions in the modern XInput2 2.2, which prevented me from building Allegro, even though I don't need touch extensions.

The amazing SiegeLord has now fixed the latest version (5.1.12 or later, may have to get from git if it's not in the zip list yet) so that the configure process checks for XInput2 2.2 and if it's not found it simply issues a warning and disables touch screen support, or something like that, which allows Allegro to still compile and work on an older system -- just without touch support.

So if you are trying to compile Allegro older than 5.1.12 on a system without XInput2 2.2, then just get 5.1.12 or later and that should solve the problem.

Thanks!

~Jesse

You're not allowed to reply/post twice in a row. you have to edit one of your previous posts, or wait for someone to post.

Although in this case, the post was over a week old and was closed automatically anyway.