This is jimtcl, packaged for Zig.
First, update your build.zig.zon:
zig fetch --save git+https://github.com/allyourcodebase/jimtcl.git
You can then import jimtcl in your build.zig with:
const jimtcl_dep = b.dependency("jimtcl", .{
.target = target,
.optimize = optimize,
});
exe.root_module.linkLibrary(jimtcl_dep.artifact("jimtcl"));