How to use in rails 4

[NeelaveniT]

Hi,
I doing code migration to rails 4, In older code we have used open_flash_chart plugin.
But I tried to use it rails 4.In rails everything mark to gem.I tried to install as gem but it shows the following
Could not find gem 'open_flash_chart' in https://github.com/pullmonkey/open_flash_chart (at master@8f0b61a).
Source does not contain any versions of 'open_flash_chart'

Kindly help me resolve this issue.