Sdif-library install in Leopard

[arterofm ()]

Hello,
I am trying to install the sdif library, but after downloading the Xcode 3.14 for Leopard and following the instructions I am not able to install it... I must confess I have difficulties with the Terminal and that I am not technical at all.
I enclose a picture of the Terminal,
can anybody help me?

Many thanks to all,

regards,

Juan
SDIF.tiff