it is already in the CVS under externals/iem/iemstream.
i think it still has the old (imo: bad) name "amp~" and i am not sure, whether the build process works (this is: whether it really builds an "amp~.pd_linux" or a "iemstream~.pd_linux"....)
i just had a glance into the repository and it seems it will not compile as it is. I hope that i can fix that shortly.
best greetings, Thomas