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Take for example, puppetlabs-apache has a Modulefile that looks like this:

name 'puppetlabs-apache'
version '0.0.3'
source 'git://github.com/puppetlabs/puppetlabs-apache.git'
author 'puppetlabs'
license 'Apache 2.0'
summary 'Puppet module for Apache'
description 'Module for Apache configuration'
project_page 'https://github.com/puppetlabs/puppetlabs-apache'

## Add dependencies, if any:
dependency 'puppetlabs-firewall', '>= 0.0.4'

puppetlabs-firewall has a Modulefile that looks like:

name 'puppetlabs-firewall'
version '0.0.4'
source 'git://github.com/puppetlabs/puppetlabs-firewall.git'
author 'puppetlabs'
license 'ASL 2.0'
summary 'Firewall Module'
description 'Manages Firewalls such as iptables'
project_page 'http://forge.puppetlabs.com/puppetlabs/firewall'

Trying to install puppetlabs/apache via puppet module install results in this:

[root@puppetmaster ~]# puppet module install puppetlabs-apache
Preparing to install into /etc/puppetlabs/puppet/modules ...
Downloading from http://forge.puppetlabs.com ...
Error: Could not install module 'puppetlabs-apache' (latest: v0.0.4)
  No version of 'puppetlabs-firewall' will satisfy dependencies
    'puppetlabs-apache' (v0.0.4) requires 'puppetlabs-firewall' (>= 0.0.4)
    Use `puppet module install --ignore-dependencies` to install only this module

Changing the dependency line on puppetlabs-apache to dependency ‘puppetlabs/firewall’, ‘>= 0.0.4’ resolves the problem.