wolfgang@Lederbauer:/var/www/html/flarum$ sudo composer create-project flarum/flarum . --stability=beta
[sudo] Passwort für wolfgang:
Installing flarum/flarum (v0.1.0-beta.6)
  - Installing flarum/flarum (v0.1.0-beta.6)
    Downloading: 100%

Created project in .
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Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - flarum/flarum-ext-akismet v0.1.0-beta.3 requires tijsverkoyen/akismet ^1.1 -> satisfiable by tijsverkoyen/akismet[1.1.0, 1.1.1].
    - flarum/flarum-ext-akismet v0.1.0-beta.5 requires tijsverkoyen/akismet ^1.1 -> satisfiable by tijsverkoyen/akismet[1.1.0, 1.1.1].
    - flarum/flarum-ext-akismet v0.1.0-beta.6 requires tijsverkoyen/akismet ^1.1 -> satisfiable by tijsverkoyen/akismet[1.1.0, 1.1.1].
    - tijsverkoyen/akismet 1.1.1 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - tijsverkoyen/akismet 1.1.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - Installation request for flarum/flarum-ext-akismet ^0.1.0 -> satisfiable by flarum/flarum-ext-akismet[v0.1.0-beta.3, v0.1.0-beta.5, v0.1.0-beta.6].