title: Error:Your requirements could not be resolved to an installable set of packages.(on server)
body: <p>I am using laravel 5.3 for my project.Now I am setting it up to the server.</p>
  
  <p>The problem occured when doing so.And i am stuck at this point of error.</p>
  
  <p>WHEN I run </p>
  
  <blockquote>
    <p>composer install --no-dev</p>
  </blockquote>
  
  <p>command following error occurs:</p>
  
  <pre><code> Problem 1
      - Installation request for fgrosse/phpasn1 1.5.2 -&gt; satisfiable by fgrosse/phpasn1[1.5.2].
      - fgrosse/phpasn1 1.5.2 requires ext-gmp * -&gt; the requested PHP extension gmp is missing from your system.
    Problem 2
      - Installation request for mdanter/ecc v0.4.2 -&gt; satisfiable by mdanter/ecc[v0.4.2].
      - mdanter/ecc v0.4.2 requires ext-gmp * -&gt; the requested PHP extension gmp is missing from your system.
    Problem 3
      - Installation request for pusher/pusher-php-server 2.6.3 -&gt; satisfiable by pusher/pusher-php-server[2.6.3].
      - pusher/pusher-php-server 2.6.3 requires ext-curl * -&gt; the requested PHP extension curl is missing from your system.
    Problem 4
      - pusher/pusher-php-server 2.6.3 requires ext-curl * -&gt; the requested PHP extension curl is missing from your system.
      - laravel-notification-channels/pusher-push-notifications 1.0.2 requires pusher/pusher-php-server 2.6.* -&gt; satisfiable by pusher/pusher-php-server[2.6.3].
      - Installation request for laravel-notification-channels/pusher-push-notifications 1.0.2 -&gt; satisfiable by laravel-notification-channels/pusher-push-notifications[1.0.2].
  
    To enable extensions, verify that they are enabled in your .ini files:
      - /etc/php/7.0/cli/php.ini
      - /etc/php/7.0/cli/conf.d/10-mysqlnd.ini
      - /etc/php/7.0/cli/conf.d/10-opcache.ini
      - /etc/php/7.0/cli/conf.d/10-pdo.ini
      - /etc/php/7.0/cli/conf.d/20-calendar.ini
      - /etc/php/7.0/cli/conf.d/20-ctype.ini
      - /etc/php/7.0/cli/conf.d/20-exif.ini
      - /etc/php/7.0/cli/conf.d/20-fileinfo.ini
      - /etc/php/7.0/cli/conf.d/20-ftp.ini
      - /etc/php/7.0/cli/conf.d/20-gettext.ini
      - /etc/php/7.0/cli/conf.d/20-iconv.ini
      - /etc/php/7.0/cli/conf.d/20-json.ini
      - /etc/php/7.0/cli/conf.d/20-mbstring.ini
      - /etc/php/7.0/cli/conf.d/20-mysqli.ini
      - /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini
      - /etc/php/7.0/cli/conf.d/20-phar.ini
      - /etc/php/7.0/cli/conf.d/20-posix.ini
      - /etc/php/7.0/cli/conf.d/20-readline.ini
      - /etc/php/7.0/cli/conf.d/20-shmop.ini
      - /etc/php/7.0/cli/conf.d/20-sockets.ini
      - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini
      - /etc/php/7.0/cli/conf.d/20-sysvsem.ini
      - /etc/php/7.0/cli/conf.d/20-sysvshm.ini
      - /etc/php/7.0/cli/conf.d/20-tokenizer.ini
    You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
  </code></pre>
  
  <p>`</p>