[bug#36311] doc: Add subsection and note about environment variables.

[swedebugia <swedebugia@riseup.net>]

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Cheers Swedebugia

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From f7507682af3b4072596e36321b5ec240e7ab3a10 Mon Sep 17 00:00:00 2001
From: swedebugia <swedebugia@riseup.net>
Date: Thu, 20 Jun 2019 18:02:16 +0200
Subject: [PATCH] doc: Add subsection and note about environment variables.

* doc/guix.texi (Binary Installation and Application Setup): Clarify the
  importance of correct environment variables.
---
 doc/guix.texi | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 65c3b8a7f..470157669 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -601,7 +601,9 @@ where @command{guix pull} will install updates (@pxref{Invoking guix pull}):
          ~root/.config/guix/current
 @end example
 
-Source @file{etc/profile} to augment @code{PATH} and other relevant
+@c This is explained further in @node Application Setup - Importance of
+@c environment variables
+Source @file{etc/profile} from @file{~.bash_profile} to augment @code{PATH} and other relevant
 environment variables:
 
 @example
@@ -1575,6 +1577,20 @@ When using Guix on top of GNU/Linux distribution other than Guix System---a
 so-called @dfn{foreign distro}---a few additional steps are needed to
 get everything in place.  Here are some of them.
 
+@subsection Importance of environment variables
+@cindex environment variables
+Environment variables in the correct place are essential to the correct
+operation of guix in a foreign system.
+
+Following the installation we recommend putting all environment variables into
+ @file{~.bash_profile} to make sure they are only executed when your login to
+ a shell (ie. open up a virtual terminal).
+
+If you use bash and put them into @file{.bashrc} you will end up with errors
+because this file is executed by bash EVERY time a new environment is entered
+(e.g. when entering a pure environment with @command{guix environment guix
+--pure} and contaminate the environment).
+
 @subsection Locales
 
 @anchor{locales-and-locpath}
-- 
2.19.2