glib/gvariant-core.c: In function ‘g_variant_ensure_size’:
glib/gvariant-core.c:339:19: error: comparison of integer expressions of different signedness: ‘gsize’ {aka ‘long unsigned int’} and ‘long int’ [-Werror=sign-compare]
   if (value->size == (gssize) -1)
                   ^~