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-rw-r--r--winsup/w32api/include/rpcdce.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/winsup/w32api/include/rpcdce.h b/winsup/w32api/include/rpcdce.h
index 97d93ce59..e07fa3a9d 100644
--- a/winsup/w32api/include/rpcdce.h
+++ b/winsup/w32api/include/rpcdce.h
@@ -8,7 +8,9 @@ extern "C" {
#define IN
#define OUT
+#ifndef OPTIONAL
#define OPTIONAL
+#endif
#define uuid_t UUID
#define rpc_binding_handle_t RPC_BINDING_HANDLE
#define rpc_binding_vector_t RPC_BINDING_VECTOR