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JACK2 v1.9.21 release

Posted on by falkTX

A new version of JACK2 has just been released.
You can grab the latest release source code at and macOS/Windows installers at

This release focuses on bug fixes, particularly interesting for users might be macOS 12 compatibility.

The official JACK2 changelog is:

  • Add shell mode to jack_control (executes commands from stdin until EOF)
  • The waf autooption --example-tools introduced in 1.9.20 is now off by default, To get the previous behavior back pass --example-tools during build. This flag (and the related tools and their code) are going to be removed in the next release.
  • Fix alignas() on non-packed architectures
  • Fix build of jack-example-tools man pages (1.9.20 regression)
  • Fix compatibility with macOS 12
  • Fix missing symbols from jack client library (error and info callback pointers)
  • Fix potential memory corruption in midi_latency_test tool
  • Fix JackWeakAPI on Windows
  • Use predefined variables in pkg-config file (required for mingw)

External changes, related to macOS/Windows installer:

  • Fix application style in QJackCtl (qwindowsvistastyle.dll was missing)
  • Update QjackCtl used in macOS/Windows installers to 0.9.7