VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT

Undocumented in source but is binding to an external library. You might be able to learn more by searching the web for its name.
nothrow @nogc extern (System)
enum VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT = VkExternalSemaphoreHandleTypeFlagBits.VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT;

Meta