How to downgrade libxml2

[Ryan Carsten Schmidt]

On Mar 28, 2025, at 20:07, Horst B Simon wrote:
> 
> I checked the MacPorts documentation, but did not understand on downgrading a port.
> I am trying to install pear using the phar download, but my version of php is failing the install.
> By searching on internet I found that it is a compatibility with libxml2, the current installed version
> is 2.13.2 and the information is that libxml2 2.13 is not compatible and libxml2 2.12 should be working.
> Is it possible that I can download and build libxml2 2.12 from MacPorts and if so how to do it.
> The older version of php is needed for Horde Webmail 5.22, that’s why I cannot use php8.2 or higher.

Older versions of php are available in MacPorts however they don't build on newer versions of macOS at present. There are tickets. I will work on them eventually. 

I don't think I'm aware of an incompatibility between older php and newer libxml2 however it wouldn't surprise me.  I will presumably discover these problems when I work on the tickets and will resolve them then. 

To downgrade libxml2, follow:

https://trac.macports.org/wiki/howto/InstallingOlderPort

Downgrading a central port like libxml2 will likely cause you all kinds of problems so I don't recommend it. Maybe revupgrade will notice and rebuild the affected ports.
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