How to build rancheros

Hi all, I was trying to follow this document to to build RancherOS on my machine.
But I hit on error right away:

./ --dev
./ line 13: dapper: command not found

I google Internet and find no clue how to install dapper on my machine. I have run RancherOS 0.4.2 with ubuntu-console as my build machine. What I am missing here? Please help!

OK, I could answer myself. The docs seems out of date. The command dapper is provided by rancher as well. Before you build, you actually need to follow this document to install dapper.
Btw, there is a minor error in that dapper document as well. The right command should be:

sudo -i
curl -L -s-uname -m > /usr/local/bin/dapper
chmod +x /usr/local/bin/dapper

Sorry about that we will try to update the docs. The correct commands are

curl -sL`uname -s`-`uname -m` > /usr/local/bin/dapper
chmod +x /usr/local/bin/dapper

We’ve updated the docs on OS on how to build to include dapper as well as updated the readme to the correct command.

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