composer: Your requirements could not be resolved to an installable set of packages.

[decentral1se]

Just got the latest copy of bc5f001 and ran:

➜  website (dev) ✔ 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 behat/behat v3.4.3 -> satisfiable by behat/behat[v3.4.3].
    - behat/behat v3.4.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 2
    - Installation request for instaclick/php-webdriver 1.4.5 -> satisfiable by instaclick/php-webdriver[1.4.5].
    - instaclick/php-webdriver 1.4.5 requires ext-curl * -> the requested PHP extension curl is missing from your system.
  Problem 3
    - Installation request for phpmd/phpmd 2.6.0 -> satisfiable by phpmd/phpmd[2.6.0].
    - phpmd/phpmd 2.6.0 requires ext-xml * -> the requested PHP extension xml is missing from your system.
  Problem 4
    - Installation request for phpunit/phpunit 4.8.36 -> satisfiable by phpunit/phpunit[4.8.36].
    - phpunit/phpunit 4.8.36 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 5
    - Installation request for squizlabs/php_codesniffer 2.9.1 -> satisfiable by squizlabs/php_codesniffer[2.9.1].
    - squizlabs/php_codesniffer 2.9.1 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.
  Problem 6
    - behat/behat v3.4.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
    - behat/mink-extension 2.3.0 requires behat/behat ^3.0.5 -> satisfiable by behat/behat[v3.4.3].
    - Installation request for behat/mink-extension 2.3.0 -> satisfiable by behat/mink-extension[2.3.0].

  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-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-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.

I'm no PHP/Composer hacker!

Should this be configurable from the repository or this is some local setup issue?

[nicksellen]

You don't need to run composer install on your local machine. Everything should work through the docker compose setup. Although if you did want to run it not via docker you can do so but would need to install all those PHP extensions on your local system.

[decentral1se]

Sticking with docker then, thanks!