How to install bson_ext gem on linux

MongoDB requires the bson_ext gem to increase performance. However, it's common to be not ready to install it.

In ubuntu (10.04 32bit) I had to run:

# apt-get install ruby1.8-dev

In systems with yum I had to run:

# yum install gcc
# yum install make
# yum install ruby-devel


Finally in both systems I could run, with no errors:

# gem install bson_ext