Mesa fails to build on the GNOME Continuous integration pipeline:

http://build.gnome.org/continuous/buildmaster/builds/2017/05/05/12/build/log-mesa.txt

../../../src/intel/vulkan/anv_allocator.c: In function 'anv_state_stream_alloc':
../../../src/intel/vulkan/anv_allocator.c:930:28: error: 'struct anv_state_stream_block' has no member named '_vg_ptr'
       VG_NOACCESS_WRITE(&sb->_vg_ptr, NULL);
                            ^
../../../src/intel/vulkan/anv_allocator.c:53:44: note: in definition of macro 'VG_NOACCESS_WRITE'
 #define VG_NOACCESS_WRITE(__ptr, __val) (*(__ptr) = (__val))
                                            ^
../../../src/intel/vulkan/anv_allocator.c: At top level:
../../../src/intel/vulkan/anv_allocator.c:1214:1: warning: 'anv_bo_cache_lookup' defined but not used [-Wunused-function]
 anv_bo_cache_lookup(struct anv_bo_cache *cache, uint32_t gem_handle)
 ^
mv -f vulkan/.deps/vulkan_libvulkan_common_la-anv_nir_lower_push_constants.Tpo vulkan/.deps/vulkan_libvulkan_common_la-anv_nir_lower_push_constants.Plo
../../../src/intel/vulkan/anv_queue.c: In function 'anv_WaitForFences':
../../../src/intel/vulkan/anv_queue.c:384:8: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
    int ret;
        ^
Makefile:3284: recipe for target 'vulkan/vulkan_libvulkan_common_la-anv_allocator.lo' failed
make[4]: *** [vulkan/vulkan_libvulkan_common_la-anv_allocator.lo] Error 1