A minor fix to the build system was required to make sure that JACK 0.124 would build with default settings on systems where the required libraries for the "zalsa" internal clients were present, but JACK was not already installed.

There are no functional changes between 0.124.0 and 0.124.1 and on systems with JACK already installed, no problem would have been noted.

The new release is here and has been tagged with "0.124.1" in git.