This version of cacao only supports the `--prefix' option, even if
configure processes the other options (`--bindir', `--libdir', etc.),
-it will screw up your installation.
+it will screw up your installation since CACAO tries to setup a
+directory tree like the JVMs from Sun or IBM do.
+
+
+Requirements:
+-------------
+
+In order to compile the Java classes from GNU classpath, you need a
+Java compiler supported by GNU classpath. To get a working classpath
+in an appropriate time, we recommend IBM jikes 1.18 or newer. For
+further instructions concerning GNU classpath, please refer to
+`src/classpath/INSTALL'.