Ruby's tk gem does not yet support Tcl/Tk 9.0. Install Tcl/Tk 8, which is the latest supported version.

[MtnBiker]

Not sure this is the right place to post, but went round and round trying to get Tk working.

export PATH="/opt/homebrew/opt/tcl-tk@8/bin:$PATH"
export LDFLAGS="-L/opt/homebrew/opt/tcl-tk@8/lib"
export CPPFLAGS="-I/opt/homebrew/opt/tcl-tk@8/include"
export PKG_CONFIG_PATH="/opt/homebrew/opt/tcl-tk@8/lib/pkgconfig"

[kotp]

From the README:

Unfortunately we have no resource to handle issue reports.

Therefore please open pull request with either:

• a bug report with a correction patch or
• (at least) a reproducible code snippet for an issue in form of a test/spec.
  Thank you in advance!