From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martin Castillo <castilma@uni-bremen.de>
Subject: bug#29814: impossible to pass spaces in GUIX_BUILD_OPTIONS
Date: Fri, 22 Dec 2017 18:58:06 +0100
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To: 29814@debbugs.gnu.org

guix/util.scm:(arguments-from-envirenment-variable) uses
char-set:graphic to split the string. this makes it impossible to pass
spaces in the arguments.

This makes it impossible to pass more than one substitute-url via the
environment.