(or, on XP and earlier, to log out and back in again). This is needed the
first time you set up Tahoe-LAFS on a particular installation of Windows.
+If you see an error like ``fatal error: Python.h: No such file or directory``
+while compiling the dependencies, you need the Python development headers. If
+you are on a Debian or Ubuntu system, you can install them with ``sudo
+apt-get install python-dev``. On RedHat/Fedora, install ``python-devel``.
+
Run "``bin/tahoe --version``" (on Windows, "``bin\tahoe --version``") to
verify that the executable tool prints out the right version number after
"``allmydata-tahoe:``".