AtkWrapper.c:187:3: 

https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-mutex-new

Apparently it is better to use g_mutex_init ()

https://developer.gnome.org/glib/stable/glib-Threads.html#g-mutex-init

Which is a bit more fiddly under these circumstances because it seems like a lot would have to be global for the various functions that call atk_bridge_mutex to be able to do that as they are:

typedef struct {
  GMutex m;
  ...
} Blob;

Blob *b;

b = g_new (Blob, 1);
g_mutex_init (&b->m)