找不到code.google.com/p/go.crypto/pbkdf2文件?

I am new to the go language.

I want to make juju charm-store server, but when I try to build/install it gives me this error:

imports code.google.com/p/go.crypto/pbkdf2: exec: "hg": executable file not found

The charm-store repository can be found here (github).

I also tried to get the package using the following command but it failed:

go get -u -v -t github.com/juju/charmstore/...

Does anyone know how to solve this problem ?

That means one of the dependencies (here code.google.com/p/go.crypto/pbkdf2)is in a Mercurial repo.

You need to install Mercurial in order for go get or the make to complete the process.
For instance, on Ubuntu:

sudo apt-get install mercurial meld

Note: go 1.4 (Q4 2014) will rename that package in golang.org/x/crypto.