[PATCH]: fix python-matplotlib install-doc phase

[Ricardo Wurmus]

Hi Guix,

attached is a patch to fix the install-doc phase of python-matplotlib.
Since UTF locales are no longer available by default the install-doc
phase fails as it depends on setting the locale to en_US.UTF-8.

The attached patch installs the locale before it is set, thereby fixing
the phase.

We likely won't be able to see the effect of this fix on hydra because
numpy fails to build, which is an input to matplotlib, but at least
matplotlib can now be compiled locally.

~~ Ricardo

>From 31f9b8800de32cdbd1fd3d2266f5fbb41548dccc Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <address@hidden>
Date: Wed, 18 Feb 2015 11:47:40 +0100
Subject: [PATCH] gnu: matplotlib: install UTF-8 locale.

* gnu/packages/python.scm (python-matplotlib): Install en_US.UTF-8 locale in
  install-doc phase to avoid encoding error.
---
 gnu/packages/python.scm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 6fe524e..7dc7435 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -2259,7 +2259,11 @@ backend = GTK3Agg~%")))))
                   (info (string-append data "/info"))
                   (html (string-append doc "/html")))
              (with-directory-excursion "doc"
-               ;; Without setting this variable we get an encoding error.
+               ;; Install and set UTF-8 locale to avoid an encoding error.
+               (setenv "LOCPATH" (getcwd))
+               (system* "localedef" "--no-archive"
+                        "--prefix" (getcwd) "-i" "en_US"
+                        "-f" "UTF-8" "./en_US.UTF-8")
                (setenv "LANG" "en_US.UTF-8")
                ;; Produce pdf in 'A4' format.
                (substitute* (find-files "." "conf\\.py")
-- 
2.1.0