+Where to build
+--------------
+If you run configure in the source directory, it prepares for compilation inside
+the source tree. In this case, an `obj` subdirectory is created to hold all generated
+files (object files, binaries, generated source files etc.) and all final files
+are linked to the `run` subdirectory. No other parts of the source tree are written into.
+
+Alternatively, you can compile in a separate object tree (which is useful when you
+want to build several different configurations from a single source tree). In order
+to do that, switch to the destination directory and issue `<source-dir>/configure ...`.
+This way, configure will create the `obj` and `run` directories locally and set up
+a Makefile which refers to the original source tree.
+