I tried it again. Failed.
Then I noticed that your folder name was /lazarus2012
While Chocolatey named mine just /lazarus
So I changed it. System made notice about possibly other install.
I went through, system probably made changes in environment variables.
Then I tried again. No luck. But got little bit different error.
So I changed back to /lazarus again (Because I did not want to confuse chocolatey with future updates).
Got the same message again about possible other install,system probably again changed environment variables.
Than I tried again. And guess what. Compiled without failure. Install also worked for all three packages. But did get several remarks. Like svn not being in the path. Hope this won't hurt, or do I need to make some extra adjustments.
Below you find the screens with remarks during compile and install of last of the 3 packages.
So what next to do...