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-rw-r--r--src/opt/sim/simSymSat.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/opt/sim/simSymSat.c b/src/opt/sim/simSymSat.c
index 4f6690e5..bdc8fbee 100644
--- a/src/opt/sim/simSymSat.c
+++ b/src/opt/sim/simSymSat.c
@@ -19,6 +19,7 @@
***********************************************************************/
#include "abc.h"
+#include "extra.h"
#include "sim.h"
#include "fraig.h"