diff --git a/libvdpau.changes b/libvdpau.changes
index b3e814d..bf1ee8e 100644
--- a/libvdpau.changes
+++ b/libvdpau.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Wed Sep  2 13:03:40 UTC 2015 - sndirsch@suse.com
+
+- added missing BuildRequires for pkgconfig(dri2proto)
+- u_src-mesa_dri2.c-define-_GNU_SOURCE.patch
+  * Without having defined _GNU_SOURCE __USE_GNU isn't defined
+    either. Though secure_getenv() in stdlib.h isn't declared.
+
 -------------------------------------------------------------------
 Tue Sep  1 14:02:11 UTC 2015 - sndirsch@suse.com
 
diff --git a/libvdpau.spec b/libvdpau.spec
index 053c697..91bcfbe 100644
--- a/libvdpau.spec
+++ b/libvdpau.spec
@@ -28,6 +28,7 @@ Source1:        http://people.freedesktop.org/~aplattner/vdpau/vdpauinfo-1.0.tar
 Source2:        README
 Source99:       baselibs.conf
 Source100:      %{name}-rpmlintrc
+Patch0:         u_src-mesa_dri2.c-define-_GNU_SOURCE.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  doxygen
@@ -36,6 +37,7 @@ BuildRequires:  gcc-c++
 BuildRequires:  graphviz
 BuildRequires:  libtool
 BuildRequires:  pkgconfig
+BuildRequires:  pkgconfig(dri2proto)
 BuildRequires:  pkgconfig(x11)
 BuildRequires:  pkgconfig(xext)
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
@@ -83,6 +85,7 @@ Its usage is documented in the README.
 
 %prep
 %setup -q -b1
+%patch0 -p1
 
 %build
 autoreconf -fi
diff --git a/u_src-mesa_dri2.c-define-_GNU_SOURCE.patch b/u_src-mesa_dri2.c-define-_GNU_SOURCE.patch
new file mode 100644
index 0000000..c303915
--- /dev/null
+++ b/u_src-mesa_dri2.c-define-_GNU_SOURCE.patch
@@ -0,0 +1,26 @@
+From 61c933961b9dd02c9dfb77f086c25b83749f4b37 Mon Sep 17 00:00:00 2001
+From: Stefan Dirsch <sndirsch@suse.de>
+Date: Wed, 2 Sep 2015 14:57:35 +0200
+Subject: [PATCH] src/mesa_dri2.c: define _GNU_SOURCE
+
+Without having defined _GNU_SOURCE __USE_GNU isn't defined either.
+Though secure_getenv() in stdlib.h isn't declared.
+---
+ src/mesa_dri2.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/mesa_dri2.c b/src/mesa_dri2.c
+index 51e8794..8594c1f 100644
+--- a/src/mesa_dri2.c
++++ b/src/mesa_dri2.c
+@@ -35,6 +35,7 @@
+ 
+ 
+ #define NEED_REPLIES
++#define _GNU_SOURCE
+ #include <X11/Xlibint.h>
+ #include <X11/extensions/Xext.h>
+ #include <X11/extensions/extutil.h>
+-- 
+1.8.4.5
+