package not compatible with latest Composer (version 2.7.2)

[Texdog]

running composer install gets this response
$ composer install
Deprecation Notice: Using ${var} in strings is deprecated, use {$var} instead in /usr/share/php/Symfony/Component/Console/Command/DumpCompletionCommand.php:48
Deprecation Notice: Using ${var} in strings is deprecated, use {$var} instead in /usr/share/php/Symfony/Component/Console/Command/DumpCompletionCommand.php:56
Deprecation Notice: Using ${var} in strings is deprecated, use {$var} instead in /usr/share/php/Composer/Autoload/AutoloadGenerator.php:879
Deprecation Notice: Using ${var} in strings is deprecated, use {$var} instead in /usr/share/php/Composer/Autoload/AutoloadGenerator.php:884
No composer.lock file present. Updating dependencies to latest instead of installing from lock file. See https://getcomposer.org/install for more information.
Loading composer repositories with package information
Updating dependencies
Deprecation Notice: Using ${var} in strings is deprecated, use {$var} instead in /usr/share/php/Composer/DependencyResolver/Problem.php:366
Your requirements could not be resolved to an installable set of packages.

It also then complains about not finding php extensions that are installed

[Texdog]

I edited those files with the suggested fixes and was able to install the software after installing php-xml