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-rw-r--r--nix/libstore/builtins.cc5
1 files changed, 4 insertions, 1 deletions
diff --git a/nix/libstore/builtins.cc b/nix/libstore/builtins.cc
index a5ebb47737..1f52511c80 100644
--- a/nix/libstore/builtins.cc
+++ b/nix/libstore/builtins.cc
@@ -1,5 +1,5 @@
/* GNU Guix --- Functional package management for GNU
- Copyright (C) 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+ Copyright (C) 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
This file is part of GNU Guix.
@@ -47,6 +47,9 @@ static void builtinDownload(const Derivation &drv,
content-addressed mirrors) works correctly. */
setenv("NIX_STORE", settings.nixStore.c_str(), 1);
+ /* Tell it about options such as "print-extended-build-trace". */
+ setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
+
/* XXX: Hack our way to use the 'download' script from 'LIBEXECDIR/guix'
or just 'LIBEXECDIR', depending on whether we're running uninstalled or
not. */