[PATCH] gnu: gnupg: Fix cross-compile issues.

[John Darrington <jmd@gnu.org>]

From: John Darrington <john@darrington.wattle.id.au>

* gnu/packages/gnupg.scm (libgpg-error): Add gcc as a native input,
  and set the CC_FOR_BUILD variable.

* gnu/packages/gnupg.scm (libgcrypt): Add libgpg-error as a native input and
  set the --with-gpg-error-prefix configure option.

* gnu/packages/gnupg.scm (libksba): Add libgpg-error as a native input and
  set the --with-gpg-error-prefix configure option.
---
 gnu/packages/gnupg.scm |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gnu/packages/gnupg.scm b/gnu/packages/gnupg.scm
index e888109..d83df50 100644
--- a/gnu/packages/gnupg.scm
+++ b/gnu/packages/gnupg.scm
@@ -44,6 +44,10 @@
        (base32
         "0pz58vr12qihq2f0bypjxsb6cf6ajq5258fmfm8s6lvwm3b9xz6a"))))
     (build-system gnu-build-system)
+    (arguments
+      `(,@(if (%current-target-system)
+            '(#:configure-flags '("CC_FOR_BUILD=gcc"))
+            '())))
     (home-page "http://gnupg.org")
     (synopsis
      "Libgpg-error, a small library that defines common error values for all GnuPG components")
@@ -68,6 +72,12 @@ Daemon and possibly more in the future.")
     (build-system gnu-build-system)
     (propagated-inputs
      `(("libgpg-error" ,libgpg-error)))
+    (native-inputs
+     `(("libgpg-error" ,libgpg-error)))
+    (arguments
+     `(#:configure-flags
+       (list (string-append "--with-gpg-error-prefix="
+                            (assoc-ref %build-inputs "libgpg-error")))))
     (home-page "http://gnupg.org/")
     (synopsis "Cryptographic function library")
     (description
@@ -118,6 +128,14 @@ provided.")
     (build-system gnu-build-system)
     (propagated-inputs
      `(("libgpg-error" ,libgpg-error)))
+    (native-inputs
+     `(("libgpg-error" ,libgpg-error)))
+    (arguments
+     `(#:configure-flags (list    
+        ,@(if (%current-target-system)
+              '("CC_FOR_BUILD=gcc")'())
+        (string-append "--with-gpg-error-prefix="
+                       (assoc-ref %build-inputs "libgpg-error")))))
     (home-page "http://www.gnupg.org")
     (synopsis
      "Libksba is a CMS and X.509 access library under development")
-- 
1.7.10.4