[arch] Alternative dependencies

[bardo]

Hi all.

I'm the packager of drupal, a popular CMS (you can find it in the
AUR). It needs a database, qhich could be mysql as well as postgresql,
so either of the two would satisfy its dependency. My build asks for
mysql (since it's the one I use), but recently a user asked me if I
did something particular that excluded the use of postgresql, and if I
could remove the mysql dependency.

Removing all db dependencies would break the dep system (whose purpose
is "if you install the program X, then you're sure you have everything
to make it work"), so I won't do it, but luke is right saying I
shouldn't close the door to other dbs... The best thing would be a way
of saying to pacman that I need mysql *or* postgre.

I'd also like to point out that drupal is written in php, so it is
interpreted. This means that it is not bound to any specific database,
it's only a configuration matter.

I'd like to hear your opinion about this issue.


bardo