http://posterous.betareduction.info/building-my-own-ecl-for-and-on-the-raspberry
The page has the proper options to use to configure, and also provides the binary. I did compile myself on Rasberry Pi, and it took VERY long time -- I had to let it run over night to finish.
Summarized Steps
$ git clone git://ecls.git.sourceforge.net/gitroot/ecls/ecl $ ./configure --prefix=/usr/local --enable-unicode=yes "CFLAGS=-mcpu=arm1176jzf-s -DAO_USE_PTHREAD_DEFS" $ make $ sudo make install