[PATCH] gnu: qt: Fix for i686.

[Taylan Ulrich Bayırlı/Kammer]

This is really hacky but seems to work.

>From 35fdd9e2fcd5b953b3a088d0bb22d84f7dc5ded9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Taylan=20Ulrich=20Bay=C4=B1rl=C4=B1/Kammer?=
 <address@hidden>
Date: Fri, 24 Apr 2015 10:43:57 +0200
Subject: [PATCH 4/4] gnu: qt: Fix for i686.

See <https://bugreports.qt.io/browse/QTBUG-45205>.

* gnu/packages/qt.scm (qt): Copy mesa's GL headers to a temporary directory,
  patching them for Qt.
---
 gnu/packages/qt.scm | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/qt.scm b/gnu/packages/qt.scm
index 8de1ffe..0f4282d 100644
--- a/gnu/packages/qt.scm
+++ b/gnu/packages/qt.scm
@@ -166,8 +166,29 @@ webrtc/tools/e2e_quality/audio/perf")))))
      `(#:phases
          (alist-replace
           'configure
-          (lambda* (#:key outputs #:allow-other-keys)
-            (let ((out (assoc-ref outputs "out")))
+          (lambda* (#:key inputs outputs #:allow-other-keys)
+            ;; Mesa headers need monkey-patching for Qt.  See:
+            ;; https://bugreports.qt.io/browse/QTBUG-45205
+            (let* ((out (assoc-ref outputs "out"))
+                   (mesa (assoc-ref inputs "mesa"))
+                   (mesa-include (string-append mesa "/include"))
+                   (mesa-pkgconfig (string-append mesa "/lib/pkgconfig"))
+                   (mesa* (tmpnam))
+                   (mesa*-include (string-append mesa* "/include"))
+                   (mesa*-pkgconfig (string-append mesa* "/lib/pkgconfig")))
+              (copy-recursively mesa-include mesa*-include)
+              (substitute* (string-append mesa*-include "/GL/glext.h")
+                (("typedef ptrdiff_t GLsizeiptr;" all)
+                 (string-append "#ifndef BUILDING_CHROMIUM\n" all))
+                (("typedef ptrdiff_t GLintptr;" all)
+                 (string-append all "\n#endif")))
+              (copy-recursively mesa-pkgconfig mesa*-pkgconfig)
+              (substitute* (find-files mesa*-pkgconfig "\\.pc$")
+                (("includedir=.*")
+                 (string-append "includedir=" mesa*-include "\n")))
+              (setenv "PKG_CONFIG_PATH"
+                      (string-append mesa*-pkgconfig ":"
+                                     (getenv "PKG_CONFIG_PATH")))
               (substitute* '("configure" "qtbase/configure")
                 (("/bin/pwd") (which "pwd")))
               (substitute* "qtbase/src/corelib/global/global.pri"
-- 
2.2.1