Unzip is missing which causes failure when downloading a zip package using Drush make

[elmertoft]

Tested on drush/drush:6

Steps to reproduce:

• Run drush make with a drush make file containing:

libraries[ckeditor][download][type] = "get"
libraries[ckeditor][download][url] = "http://download.cksource.com/CKEditor/CKEditor/CKEditor%204.0.3/ckeditor_4.0.3_standard.zip"
libraries[ckeditor][directory_name] = "ckeditor"
libraries[ckeditor][destination] = "libraries"

• The following error is given:

Unable to unzip                                                          [error]

Proposed solution

• Install the unzip package in the base file