Support optional dependencies

Bug #1105831 reported by Robert Ancell on 2013-01-26
18
This bug affects 4 people
Affects Status Importance Assigned to Milestone
Bake
Medium
Unassigned

Bug Description

Support optional dependencies, i.e.

programs.foo {
  sources = ...
  packages = foo \
             bar (optional)
}

There should be a variable if the program needs to know if bar is available, i.e.

packages.bar.exists = false

description: updated
description: updated
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