"gimme master" fails because it's bootstrapping with 1.18

[pohly]

When invoking "gimme master" on a clean system, it fails with:

$ gimme master
I don't have any idea what to do with 'master'.
  (using download type 'auto')

Current Go master requires Go >= 1.20.6. The reason that it fails is that gimme first downloads 1.18, then tries to use that to build current master. make.bash fails (not visible in the output) and gimme gives up as shown above.

As a workaround, one can do:

$ gimme v1.21.0
...
$ gimme --list
1.21.0
$ gimme master

unset GOOS;
unset GOARCH;
export GOROOT='/home/pohly/.gimme/versions/go';
export PATH="/home/pohly/.gimme/versions/go/bin:${PATH}";
go version >&2;

export GIMME_ENV="/home/pohly/.gimme/envs/gomaster.env"

[pohly]

$ gimme --version
v1.5.4