You could:
1) circumvent the GUI interface and prepare your gfn file via the
command-line interface by manually editing the spec file, but I
doubt we never ever documented this, which is a shame;
2) alternatively, you may download and compile the CVS version, in
which I just committed a change so that we have room up until
version 1.10.19;
3) alternatively, wait for a couple of days until Allin has prepared
a snapshot which contains today's patch;
4) alternatively, you could create your package as usual, then open
the gfn file with a text editor of your choice (a gfn file is just
an xml file) and change the "minver" property to the
"gretl-function-package" tag to "1.9.12" by hand. Then, send it
to
me or Allin and we'll upload it to the main server for you.
However, the change doesn't seem to be persistent -- I choose minor
version 12, save, close (the function package def. window), re-open, and
instead of 12 it says 2.
-s