set from environment variable

In vimrc, I want to set the path from an environment variable, eg.:

set path = '.,' . $SOMEVAR . '/**'

So if $SOMEVAR was /foo/bar, I want vim's path to be '.,/foo/bar/**'.

I've tried expand("$SOMEVAR"), tried 'let'ing the path instead of 'set'ing it, but I'm just missing the exact syntax for doing this.

This wikia page almost has the answer, but doesn't cover set:

http://vim.wikia.com/wiki/Environment_variables

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