Trying to install a 5.3, I follow the following steps:

• I install platform with git clone and do:

  git checkout stable-5.3
  

• I run composer update with:
  php -d memory_limit=-1 composer.phar install --prefer-dist --no-dev
• I get legacy-ee with git-clone and do:

  git checkout stable-5.3
  

• I get kernel-ee with git-clone and do:

  git checkout stable-5.3
  

• I assign proper permissions with:

  sudo setfacl -R -m u:apache:rwx -m u:apache:rwx ezpublish/{cache,logs,config,sessions} ezpublish_legacy/{design,extension,settings,var} web
  sudo setfacl -dR -m u:apache:rwx -m u:`whoami`:rwx ezpublish/{cache,logs,config} ezpublish_legacy/{design,extension,settings,var} web
  

• I try to run assetic dump with:

  php ezpublish/console assets:install --symlink web
  php ezpublish/console ezpublish:legacy:assets_install --symlink web
  php ezpublish/console assetic:dump --env=prod web
  

  and on the last command I get the following:

  PHP Fatal error:  Declaration of eZPublishCorePersistenceLegacyContentSearchHandler_000000003f2ced6200000000717ec2cc::deleteLocation() must be compatible with that of eZ\Publish\SPI\Search\Content\Handler::deleteLocation() in /var/www/html/ezpublish53/ezpublish/cache/prod/ezpublishProdProjectContainer.php on line 14346
  
  Fatal error: Declaration of eZPublishCorePersistenceLegacyContentSearchHandler_000000003f2ced6200000000717ec2cc::deleteLocation() must be compatible with that of eZ\Publish\SPI\Search\Content\Handler::deleteLocation() in /var/www/html/ezpublish53/ezpublish/cache/prod/ezpublishProdProjectContainer.php on line 14346
  

  So I try to run it again after clearing ezpublish/cache/*
  and then I get:

  PHP Catchable fatal error:  Argument 2 passed to eZ\Publish\Core\MVC\Legacy\Session\LegacySessionProxy::__construct() must implement interface SessionHandlerInterface, instance of Symfony\Component\HttpFoundation\Session\Storage\Handler\NativeFileSessionHandler given, called in /var/www/html/ezpublish53/ezpublish/cache/prod/ezpublishProdProjectContainer.php on line 3620 and defined in /var/www/html/ezpublish53/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Legacy/Session/LegacySessionProxy.php on line 35
  
  Catchable fatal error: Argument 2 passed to eZ\Publish\Core\MVC\Legacy\Session\LegacySessionProxy::__construct() must implement interface SessionHandlerInterface, instance of Symfony\Component\HttpFoundation\Session\Storage\Handler\NativeFileSessionHandler given, called in /var/www/html/ezpublish53/ezpublish/cache/prod/ezpublishProdProjectContainer.php on line 3620 and defined in /var/www/html/ezpublish53/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Legacy/Session/LegacySessionProxy.php on line 35