As usual, see http://gretl.sourceforge.net/

This is mostly a bug-fix release, but there are two new features to
report:

* An enhancement of the "biprobit" command, whereby rho, the
correlation between the errors in the two equations, is available as
part of the parameter vector, $coeff, and the covariance matrix,
$vcv.

* Support for linear programming, courtesy of the lpsolve library.
On Linux you need to install the lpsolve package to activate this
feature (but that's easy via your distro's package manager); in our
Windows and macOS packages we supply a suitable build of the
library. PDF documentation can be found under the gretl Help menu
("Linear programming").

Here's the change log:

2021-09-30 version 2021d
- "biprobit" command: include rho in $coeff, $stderr and
   $vcv
- New function lpsolve(): supports linear programming via
   the lpsolve library
- Prevent opening of general and console preferences
   dialogs simultaneously
- Fix partial breakage of the panel-time plotting facility
- Fix potential failure mode in echoing script input lines
   in the GUI program
- Fix a small and somewhat unlikely memory leak
- Fix a GUI build error when using GTK 2
- Fix Windows bug: greek-letter identifiers not working
   in some locales
- Fix Mac bug: binary data read/write not accessible
- Fix Linux bug: possible crash when running MPI from the
   GUI program

Allin
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