georgiev/rubyfb — pull request #15 by mariuz (2012-04-13 14:20:24+00:00)
Title: On Ubuntu and Debian systems you will need the Firebird development headers   

sudo apt-get install firebird2.5-dev

See the issue when is not installed
http://mapopa.blogspot.com/2012/03/migrations-do-work-with-rubyfb.html?showComment=1334011301766#c519190670027115424