brew install linuxkit fails on macOS 11.3.1, Homebrew 3.1.5

[jfoy]

local:~ $ brew tap linuxkit/linuxkit
Updating Homebrew...
==> Auto-updated Homebrew!
Updated Homebrew from 684505b55 to 3e3276260.
==> Tapping linuxkit/linuxkit
Cloning into '/usr/local/Homebrew/Library/Taps/linuxkit/homebrew-linuxkit'...
remote: Enumerating objects: 92, done.
remote: Total 92 (delta 0), reused 0 (delta 0), pack-reused 92
Receiving objects: 100% (92/92), 18.43 KiB | 1.42 MiB/s, done.
Resolving deltas: 100% (36/36), done.
Tapped 4 formulae (33 files, 53.0KB).
local:~ $ brew install linuxkit
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 2 taps (homebrew/core and homebrew/cask).
==> Updated Formulae
Updated 19 formulae.
==> Updated Casks
Updated 3 casks.

==> Installing linuxkit from linuxkit/linuxkit
==> Downloading https://github.com/linuxkit/linuxkit/archive/v0.6.tar.gz
==> Downloading from https://codeload.github.com/linuxkit/linuxkit/tar.gz/v0.6
            -#O=-#     #     #
==> make local-build
Last 15 lines from ~/Library/Logs/Homebrew/linuxkit/01.make:
2021-05-05 22:31:39 -0700

make
local-build

mkdir -p bin
fatal: not a git repository (or any of the parent directories): .git
CGO_ENABLED=0 go build -o bin/linuxkit --ldflags "-X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.GitCommit= -X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.Version="v0.6"" github.com/linuxkit/linuxkit/src/cmd/linuxkit
no required module provides package github.com/linuxkit/linuxkit/src/cmd/linuxkit: go.mod file not found in current directory or any parent directory; see 'go help modules'
make: *** [local-static] Error 1

If reporting this issue please do so at (not Homebrew/brew or Homebrew/core):
  https://github.com/linuxkit/homebrew-linuxkit/issues

local:~ $ brew --version
Homebrew 3.1.5-78-g3e32762
Homebrew/homebrew-core (git revision b656f2042d; last commit 2021-05-06)
Homebrew/homebrew-cask (git revision 39ec1230fc; last commit 2021-05-06)
local:~ $

[mar-io]

try this: brew install --HEAD linuxkit

[jfoy]

brew install --HEAD linuxkit succeeds, thanks. Whatever change unblocked this happened on master since v0.8; I suspect it's 93ada489f9c07e3a5e21d5556262020a89f4fe86 , but haven't done a git bisect to prove it.