* Package name    : libobjc2
  Version         : 2.3
  Upstream Author : David Chisnall <gnustep@theravensnest.org>
* URL or Web page : https://github.com/gnustep/libobjc2
* License         : Expat
  Programming lang: C, Objective-C, C++, Objective-C++, Assembly
  Description     : GNUstep Objective-C runtime

 The GNUstep Objective-C runtime was designed as a drop-in replacement
 for the GNU/GCC runtime.  It supports three ABIs:

  * The old GCC ABI, which provides support for Objective-C 1.0
    features.  This can be selected via the -fobjc-runtime=gcc flag in
    Clang or by compiling with GCC.
  * The initial GNUstep non-fragile ABI, which was intended to be
    compatible with the GCC ABI, but provide support for modern
    Objective-C features.  This can be selected with the
    -fobjc-runtime=gnustep-1.9 flag in Clang.
  * The modern (v2) ABI, which provides richer reflection metadata,
    smaller binaries and reduced memory usage.  This is selected with the
    -fobjc-runtime=gnustep-2.0 flag in Clang 7.0 or later.

 All ABIs support the following features above and beyond the GCC
 runtime:

  * The modern Objective-C runtime APIs, initially introduced with Mac
    OS X 10.5.
  * Blocks (closures).
  * Synthesised property accessors.
  * Efficient support for @synchronized().
  * Type-dependent dispatch, eliminating stack corruption from
    mismatched selectors.
  * Support for the associated reference APIs introduced with Mac OS X
    10.6.
  * Support for the automatic reference counting APIs introduced with
    Mac OS X 10.7.

* * *

This package will be maintained by the GNUstep team.

Both binary packages libobjc2-dev and libobjc4 will be co-installable
with the GNU Objective-C runtime (libobjc-VER-dev and libobjc4).  For
forky (or duke if it turns out that time is insufficient) we plan to
implement support for both runtimes in all GNUstep packages on all
architectures where libobjc2 is available.

The default runtime will remain GNU as it is available on all
architectures but a sysadmin will be able to switch to the GNUstep
runtime runtime permanently.  It will also be possible to temporarily
swap runtimes for testing purposes.

Yavor Doganov wrote:
                                        ^^^^^^^^
                                        libobjc4.6

Sorry for the thinko.