C Library for XBee 900 MHz?

I am looking for the C library for XBee 900HP. I found the https://github.com/digidotcom/xbee_ansic_library online, but it looks to be abandoned. Currently I am running my xbee off of my raspberry pi, but I want to get the C program working so I can move to an atmega chip.

While Digi does not directly support the C lib you found, it will work with the Current 900 HP product as the API interface used is the same.