After a period that is much longer than I had hoped for, a new release V5.6.0 of the MusicKit is now available. The change log is huge, but the highlights are:
Documentation on building the MusicKit has been improved.
Now builds on MacOS 10.5.X Intel or PPC and GNUstep.
No longer requires external libraries to build. The system will be built with reduced functionality (mostly impacting the SndKit) if the dependent libraries are not installed.
A more complete set of applications, utility commands and examples are built on both MacOS X and particularly on GNUstep.
HelpViewer help documentation is now available for some Applications (ScorePlayer, Spectro, EnvelopeEd).
A set of C language UnitGenerators by Julius Smith has now been incorporated into the distribution. A future version of the MusicKit will properly integrate these with the Objective-C unit generators for native synthesis. Julius' contribution greatly simplifies this process.
A binary installation package for MacOS X is currently in preparation. At the moment, only the source is released.