aMSN doesn't need to be compiled or anything.. You just have to
a) download it
b) Go to the shell :
+ Get into the correct directory (where you downloaded it)
+ uncompress it (tar -xvzf amsn-0_xx.tar.gz)
c) Type "cd msn" without the quotes.
d) Type "wish amsn" without the quotes.
You can find the Frequently Asked Questions here: