AM_XGETTEXT_OPTION macro registers a command-line option to be
used in the invocations of
xgettext in the po/ directories
of the package.
For example, if you have a source file that defines a function ‘error_at_line’ whose fifth argument is a format string, you can use
xgettext to mark all translatable strings in ‘gettext’
invocations that occur as fifth argument to this function as ‘c-format’.
See xgettext Invocation for the list of options that
The use of this macro is an alternative to the use of the ‘XGETTEXT_OPTIONS’ variable in po/Makevars.