qemu-kvm: Fix check for librt

pkgs/os-specific/linux/qemu-kvm/default.nix

@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
     sha256 = "018vb5nmk2fsm143bs2bl2wirhasd4b10d7jchl32zik4inbk2p9";
   };
 
+  patches = [ ./fix-librt-check.patch ];
+
   postPatch =
     '' for i in $(find . -type f)
        do

pkgs/os-specific/linux/qemu-kvm/fix-librt-check.patch

@@ -0,0 +1,19 @@
+diff -Naur qemu-kvm-1.2.0-orig/configure qemu-kvm-1.2.0/configure
+--- qemu-kvm-1.2.0-orig/configure	2012-09-06 04:31:27.000000000 -0400
++++ qemu-kvm-1.2.0/configure	2013-02-15 11:04:45.923477251 -0500
+@@ -2682,13 +2682,14 @@
+ cat > $TMPC <<EOF
+ #include <signal.h>
+ #include <time.h>
+-int main(void) { return clock_gettime(CLOCK_REALTIME, NULL); }
++int main(void) { return timer_gettime(CLOCK_REALTIME, NULL); }
+ EOF
+ 
+ if compile_prog "" "" ; then
+   :
+ elif compile_prog "" "-lrt" ; then
+   LIBS="-lrt $LIBS"
++  libs_qga="-lrt $libs_qga"
+ fi
+ 
+ if test "$darwin" != "yes" -a "$mingw32" != "yes" -a "$solaris" != yes -a \