Errors while using a laravel 5 boilerplate

I want to use http://ift.tt/1Lux1dt as a starting point for my Laravel project, but when I do composer install i get the following errors.

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 guzzle/guzzle v3.9.3 -> satisfiable by guzzle/guzzle[v3.9.3].
    - guzzle/guzzle v3.9.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
  Problem 2
    - Installation request for stripe/stripe-php v1.18.0 -> satisfiable by stripe/stripe-php[v1.18.0].
    - stripe/stripe-php v1.18.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.
  Problem 3
    - guzzle/guzzle v3.9.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - league/oauth1-client 1.5.0 requires guzzle/guzzle 3.* -> satisfiable by guzzle/guzzle[v3.9.3].
    - Installation request for league/oauth1-client 1.5.0 -> satisfiable by league/oauth1-client[1.5.0].

How to resolve this?

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