6.1.1 Input file location

`def.po'

Translations referring to old sources.

`ref.pot'

References to the new sources.

`-D directory'

`--directory=directory'

Add directory to the list of directories. Source files are searched relative to this list of directories. The resulting `.po' file will be written relative to the current directory, though.

`-C file'

`--compendium=file'

Specify an additional library of message translations. See section 6.11 Using Translation Compendia. This option may be specified more than once.