@cindex output format, setting
+@item -d,--define-default=@var{var}=@var{val}
+This defines an internal variable @var{var} as the Scheme value
+@var{val}.
+
+Supported values include:
+@table @code
+@item resolution
+set PNG resolution
+@item preview-include-book-title
+include book-titles in preview
+@end table
+
+These settings are returned when calling
+@code{(ly:get-option 'command-line-settings)} from Scheme.
+
@item -h,--help
Show a summary of usage.
(e.g., @file{/usr/share/lilypond})
should be copied.
-@ignore
-FIXME: fact-check; delete very soon. -gp
-, and the content of the @file{fonts},
-@file{dvips} and @file{web2c} directories of the @TeX{} installation
-(usually under @file{/usr/share/texmf}) should be copied, too. If your
-@TeX{} installation uses @file{ls-R} caches, copy also the cache inside the root
-of the installation.
-@end ignore
-
If problems arise, the simplest way to trace them down is to run
LilyPond using @command{strace}, which will allow you to determine which
files are missing.