+ * libvirt (optional)
+ Collect statistics from virtual machines.
+
+
+Configuring / Compiling / Installing
+------------------------------------
+
+ To configure, build and install collectd with the default settings, run
+ `./configure && make && make install'. For detailed, generic instructions
+ see INSTALL. For a complete list of configure options and their description,
+ run `./configure --help'.
+
+ By default, the configure script will check for all build dependencies and
+ disable all plugins whose requirements cannot be fulfilled (any other plugin
+ will be enabled). To enable a plugin, install missing dependencies (see
+ section `Prerequisites' above) and rerun `configure'. If you specify the
+ `--enable-<plugin>' configure option, you can force the plugin to be built.
+ This will most likely fail though unless you're working in a very unusual
+ setup and you really know what you're doing.
+
+ By default, collectd will be installed into `/opt/collectd'. You can adjust
+ this setting by specifying the `--prefix' configure option - see INSTALL for
+ details. If you pass DESTDIR=<path> to `make install', <path> will be
+ prefixed to all installation directories. This might be useful when creating
+ packages for collectd.
+
+
+Crosscompiling
+--------------
+
+ To compile correctly collectd needs to be able to initialize static
+ variables to NAN (Not A Number). Some C libraries, especially the GNU
+ libc, have a problem with that.
+
+ Luckily, with GCC it's possible to work around that problem: One can define
+ NAN as being (0.0 / 0.0) and `isnan' as `f != f'. However, to test this
+ ``implementation'' the configure script needs to compile and run a short
+ test program. Obviously running a test program when doing a cross-
+ compilation is, well, challenging.
+
+ If you run into this problem, you can use the `--with-nan-emulation'
+ configure option to force the use of this implementation. We can't promise
+ that the compiled binary actually behaves as it should, but since NANs
+ are likely never passed to the libm you have a good chance to be lucky.
+
+
+Contact
+-------
+
+ For questions, bugreports, development information and basically all other
+ concerns please send an email to collectd's mailinglist at
+ <collectd at verplant.org>.
+
+ For live discussion and more personal contact visit us in IRC, we're in
+ channel #collectd on freenode.
+
+