TYPO3 Core

I discovered a dependency-problem while installing current TYPO3 8.7.7 via composer, using PHP 7.0

Running composer install [composer install]

Loading composer repositories with package information
    Installing dependencies (including require-dev) from lock file
    Your requirements could not be resolved to an installable set of packages.

Problem 1
        - Installation request for doctrine/annotations v1.5.0 -> satisfiable by doctrine/annotations[v1.5.0].
        - doctrine/annotations v1.5.0 requires php ^7.1 -> your PHP version (7.0.22) does not satisfy that requirement.
      Problem 2
        - Installation request for doctrine/cache v1.7.1 -> satisfiable by doctrine/cache[v1.7.1].
        - doctrine/cache v1.7.1 requires php ~7.1 -> your PHP version (7.0.22) does not satisfy that requirement.
      Problem 3
        - Installation request for doctrine/collections v1.5.0 -> satisfiable by doctrine/collections[v1.5.0].
        - doctrine/collections v1.5.0 requires php ^7.1 -> your PHP version (7.0.22) does not satisfy that requirement.
      Problem 4
        - doctrine/annotations v1.5.0 requires php ^7.1 -> your PHP version (7.0.22) does not satisfy that requirement.
        - doctrine/common v2.7.3 requires doctrine/annotations 1.* -> satisfiable by doctrine/annotations[v1.5.0].
        - Installation request for doctrine/common v2.7.3 -> satisfiable by doctrine/common[v2.7.3].

An error occured executing composer install [Exit code: 2]

So TYPO3 8.7.7 has PHP 7.0 - 7.1.x as dependency, but dependent packages from doctrine requires PHP 7.1 - so TYPO3 8 is not installable with PHP 7.0.