[PATCH] partial fix for zlib cross compilation

[John Darrington <john@darrington.wattle.id.au>]

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zlib in its wisdom, doesn't use autoconf.  Hence there are special 
methods for cross compiling.  This patch implements one of these methods.
Certain targets will need further patches ...




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From 592a7329b446d2d8e8a1f7c2e5e6bcb622c7c69c Mon Sep 17 00:00:00 2001
From: John Darrington <jmd@gnu.org>
Date: Mon, 9 Dec 2013 22:57:15 +0100
Subject: [PATCH] gnu: compression: Fix cross-compilation of zlib.

* gnu/packages/compression.scm : Zlib uses a non-standard
  way of configuring for cross-compilation.  Thanks to Ludovic
  for showing me the correct way to fix this.
---
 gnu/packages/compression.scm |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/compression.scm b/gnu/packages/compression.scm
index efffa92..723caa8 100644
--- a/gnu/packages/compression.scm
+++ b/gnu/packages/compression.scm
@@ -48,8 +48,11 @@
                    ;; extra flags like `--enable-fast-install', so we need to
                    ;; invoke it with just what it understand.
                    (let ((out (assoc-ref outputs "out")))
-                     (zero? (system* "./configure"
-                                     (string-append "--prefix=" out)))))
+                     ,@(if (%current-target-system) `((setenv "CHOST"
+                                                              ,(%current-target-system))) '())
+                     (zero?
+                      (system* "./configure"
+                               (string-append "--prefix=" out)))))
                  %standard-phases)))
     (home-page "http://zlib.net/")
     (synopsis "The zlib compression library")
-- 
1.7.10.4