tests: skip vulkan test if vulkan not found
project('vulkan test', 'c')
-vulkan_dep = dependency('vulkan')
+vulkan_dep = dependency('vulkan', required : false)
+if not vulkan_dep.found()
+ error('MESON_SKIP_TEST: vulkan not found.')
+endif
e = executable('vulkanprog', 'vulkanprog.c', dependencies : vulkan_dep)
