`go install` fails on Alpine GNU/Linux from bb11ff7

[camelpunch]

Our CI started failing because we were depending on master dep.

From bb11ff7 a go install ./... (hence also a go get) exits 2 like so:

bash-4.3# go install ./...
# github.com/golang/dep/internal/gps
internal/gps/constraints.go:334: undefined: sort.SliceStable
internal/gps/constraints.go:353: undefined: sort.SliceStable
internal/gps/lock.go:55: undefined: sort.SliceIsSorted
internal/gps/lock.go:62: undefined: sort.Slice

We found this SHA using git bisect between v0.3.0 and master.

What did you expect to see?

We expected go get to successfully install dep.

We do not see this problem on OSX.

[ebati]

It seems like you are using an older version of go (those sort functions are introduced in 1.8). dep requires Go 1.8 or newer to compile as noted in readme.

[ibrasho]

As @ebati said, please check the Go version on that machine to ensure it's >= 1.8

[camelpunch]

Yep, 1.7.5. Thanks!