Fix configure options in qemu.

component/qemu-kvm/buildout.cfg

 [buildout]
-extends = 
+extends =
   ../../component/gnutls/buildout.cfg
   ../../component/libpng/buildout.cfg
   ../../component/libuuid/buildout.cfg
@@ -19,7 +19,9 @@ md5sum = b56e73bdcfdb214d5c68e13111aca96f
 depends =
   ${libpng:so_version}
 configure-options =
-  --target-list=""
+  --target-list="x86_64-softmmu i386-softmmu"
+  --enable-system
+  --with-system-pixman
   --disable-sdl
   --disable-xen
   --enable-vnc-tls
@@ -37,4 +39,3 @@ configure-options =
 environment =
   PATH=${pkgconfig:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${gnutls:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig:${pixman:location}/lib/pkgconfig
-