composer install -problem fix

composer install -problem fix

problem:

Problem 1
    - The requested PHP extension ext-gd * is missing from your system. Install or enable PHP's gd extension.
  Problem 2
    - The requested PHP extension ext-curl * is missing from your system. Install or enable PHP's curl extension.
  Problem 3
    - Installation request for braintree/braintree_php 2.39.0 -> satisfiable by braintree/braintree_php[2.39.0].
    - braintree/braintree_php 2.39.0 requires ext-curl * -> the requested PHP extension curl is missing from your system.

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php5/cli/php.ini
    - /etc/php5/cli/conf.d/05-opcache.ini
    - /etc/php5/cli/conf.d/10-pdo.ini
    - /etc/php5/cli/conf.d/20-intl.ini
    - /etc/php5/cli/conf.d/20-json.ini
    - /etc/php5/cli/conf.d/20-mcrypt.ini
    - /etc/php5/cli/conf.d/20-readline.ini
    - /etc/php5/cli/conf.d/20-xsl.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.


Solution:
sudo apt-get update
sudo apt-get install php5-gd
sudo apt-get install php5-curl

That helps. Thanks!