+ ```sh
+ make install DESTDIR=/opt/bup PREFIX=''
+ ```
+
+ - The Python version that bup will use is determined by the
+ `python-config` program chosen by `./configure`, which will search
+ for a reasonable version unless `BUP_PYTHON_CONFIG` is set in the
+ environment. You can see which Python executable was chosen by
+ looking at the configure output, or examining
+ `config/config.var/bup-python-config`, and you can change the
+ selection by re-running `./configure`.
+
+- If you want to specify your own `CPPFLAGS`, `CFLAGS`, or `LDFLAGS`,
+ you can set them for individual `make` invocations, e.g. `make
+ CFLAGS=-O0 check`, or persistently via `./configure` with
+ `CFLAGS=-O0 ./configure`. At the moment, `make clean` clears the
+ configuration, but we may change that at some point, perhaps by
+ adding and requiring a `make distclean` to clear the configuration.