@cindex LANG
-@cindex LILYPONDPREFIX
+@cindex LILYPOND_DATADIR
@code{Lilypond} recognizes the following environment variables:
@table @code
-@item LILYPONDPREFIX
+@item LILYPOND_DATADIR
This specifies a directory where locale messages and
data files will be looked up by default. The directory should contain
subdirectories called @file{ly/}, @file{ps/}, @file{tex/}, etc.