README: more install instructions

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 == DEPENDENCIES ==
-$ cabal install harpy
-$ cabal install hs-java # 0.2 at the moment!
+=== HARPY ===
+       $ cabal install harpy
+
+=== HS-JAVA ===
+for `hs-java' a patched build is needed:
+       $ git clone git://wien.tomnetworks.com/hs-java.git
+       $ git checkout v0.2
+       $ cd hs-java; cabal configure; cabal build; cabal install
+
+
+== NOTE ==
+unfortunately, many haskell libaries arn't tested very well, so building
+libraries from hackage can be a very painful trip.
+
+a system configuration we had success building all required
+libraries (yes, no x86_64 so far!):
+       $ uname -a
+       Linux hermann 2.6.32-22-generic-pae #36-Ubuntu SMP Thu Jun 3 23:14:23 UTC
+       2010 i686 GNU/Linux
+       $ cat /etc/issue
+       Ubuntu 10.04.4 LTS \n \l
+       $ ghc --version
+       The Glorious Glasgow Haskell Compilation System, version 6.12.1
+       $ gcc --version
+       gcc (Ubuntu 4.4.3-4ubuntu5.1) 4.4.3
+       Copyright (C) 2009 Free Software Foundation, Inc.
+       This is free software; see the source for copying conditions.  There is NO
+       warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.