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-rw-r--r--machxo2/arch.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/machxo2/arch.h b/machxo2/arch.h
index 489a44ab..214d8bb2 100644
--- a/machxo2/arch.h
+++ b/machxo2/arch.h
@@ -22,6 +22,7 @@
#define MACHXO2_ARCH_H
#include <cstdint>
+#include <set>
#include "base_arch.h"
#include "nextpnr_namespaces.h"