Hallo!
Well.. nevermind. I reinstalled extended 0.38-4 and now it is working.
Hooray! I can't wait to work with it. But... I would still like to know how to compile so I can use it with a more recent version of Pd.
I added iemmatrix now also in the libdir format - so you should also be able to compile it with the pd-extended makefile:
http://pure-data.cvs.sourceforge.net/pure-data/scripts/checkout-developer-la...
go in the folder pure-data/externals
now you can run "make iemmatrix"
However, you should also be able to compile it with the original autoconf/make system from iemmatrix.
LG Georg