$ sudo pacman -S mongodb
$ pacman -Qi mongodb

Name            : mongodb
Version         : 3.2.6-2
Description     : A high-performance, open source, schema-free document-oriented database
Architecture    : x86_64
URL             : http://www.mongodb.org
Licenses        : AGPL3
Groups          : None
Provides        : None
Depends On      : pcre  snappy  openssl  libsasl  boost-libs  yaml-cpp  wiredtiger
Optional Deps   : libpcap: needed for mongosniff [installed]
                  mongodb-tools: mongoimport, mongodump, mongotop, etc
Required By     : None
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 102.28 MiB
Packager        : Bartlomiej Piotrowski <bpiotrowski@archlinux.org>
Build Date      : Fri 13 May 2016 09:40:18 AM BST
Install Date    : Thu 30 Jun 2016 05:24:15 AM BST
Install Reason  : Explicitly installed
Install Script  : Yes
Validated By    : Signature

$ mongo

$ sudo pacman -S libstdc++5