bug#20402: updated patch to pass http_proxy and https_proxy env vars to derivation builds

[Joshua Randall]

Tags: patch

I've updated my patch to also modify guix/derivations.scm to add a setting for nix's impureEnvVars, such that it will pass http_proxy and https_proxy variables from the guix daemon to the build processes (which nix will do only for fixed-output derivations). 

I believe this is working, but I've now run into a third problem: the bootstrap guile is only v2.0.9, and v.2.0.10 or later is required for proxy support. What would I need to do to use a later version of bootstrap guile? 

Cheers,

Josh.

guix-git-dd3a42e6-http-proxy-impure-fix.patch
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