How to downgrade libxml2

[Horst B Simon]

> On 29 Mar 2025, at 12:28, Ryan Carsten Schmidt <ryandesign at macports.org> wrote:
> 
> 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.

The error I am getting when running: /opt/local/bin/php74 -d detect_unicode=0 go-pear.phar is:nstalling phar:///private/tmp/go-pear.phar/PEAR/go-pear-tarballs/XML_Util-1.4.5.tar...

parsePackageName(): array $param must contain a valid package name in "phar:///private/tmp/go-pear.phar/PEAR/go-pear-tarballs/PEAR-1.10.16.tar"
Invalid tag order in <dependencies>, found <_content> expected one of "group"
Parsing of package.xml from file "/private/tmp/pear/install/pearXuHHr9/package.xml” failed

If I read correct is was fixed in PHP8.2 onwards in Fix GH-14834 <https://github.com/php/php-src/issues/14834>: Error installing PHP when --with-pear is used.

Maybe if I patch php74 the same way it might work.

Regards,
Horst Simon

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