Installation attempt gives output:

If you receive a fatal error, refresh this page to continue the installation

    Setting up 'mysite/_config.php'...
    Setting up /var/www/SS_CMS/mysite/_config.php
    Setting up 'mysite/_config/config.yml'
    Setting up /var/www/SS_CMS/mysite/_config/config.yml
    Setting up '.htaccess' file...
    Setting up /var/www/SS_CMS/.htaccess
    Building database schema...

    Fatal error: Interface 'PHPUnit_Framework_TestListener' not found in /var/www/SS_CMS/framework/src/Dev/SapphireTestReporter.php on line 46

Refreshing the page does not continue the installation. I'm hoping somebody can point me in the right direction.

Same fatal error over here with no way out

Hi guys,

Same problem here and no way to fix it!

Fatal error: Uncaught MJS\TopSort\CircularDependencyException: Circular dependency found: modelascontrollerroutes->mysite->modelascontrollerroutes in /var/www/user/vendor/marcj/topsort/src/CircularDependencyException.php:34 Stack trace: #0 /var/www/user/vendor/marcj/topsort

Yep. Same problem as you Filis. Would love to try it out but:

Building database schema...

Fatal error: Uncaught exception 'MJS\TopSort\CircularDependencyException'

Anyone planning on addressing this at all?

How did you install SilverStripe? Via composer or the ZIP/TAR download?

I get:
Fatal error: Call to undefined method SilverStripe\Config\Collections\CachedConfigCollection::setPool() in XXX/framework/src/Core/Config/CoreConfigFactory.php on line 51
with a Composer install of alpha 5.

And:
Fatal error: Interface 'PHPUnit_Framework_TestListener' not found in /XXX/framework/src/Dev/SapphireTestReporter.php on line 46
when installing from the TAR.

I used composer. Yooohoooo Devs, where are you?! Let's get some help here to check this out, yes?

See here: https://github.com/silverstripe/silverstripe-framework/issues/6737