+@node Environment variables
+@section Environment variables
+
+Some maintenance scripts and instructions in this guide rely on
+the following environment variables. They should be predefined in
+LilyDev distribution (see @ref{LilyDev}); if you set up your own
+development environment, you can set them by appending these settings to
+your @file{~/.bashrc} (or whatever defines your default environment
+variables for the user account for LilyPond development), then logging
+out and in (adapt directories to your setup):
+
+@example
+LILYPOND_GIT=~/lilypond-git
+export LILYPOND_GIT
+LILYPOND_BUILD_DIR=~/lilypond-git/build
+export LILYPOND_BUILD_DIR
+@end example
+
+The standard build and install procedure (with @code{autogen.sh},
+@code{configure}, @code{make}, @code{make install}, @code{make doc}
+@dots{}) does not rely on them.
+
+In addition, for working on the website, @code{LILYPOND_WEB_MEDIA_GIT}
+should be set to the repository lilypond-extra, see
+@ref{lilypond-extra}.
+