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-rw-r--r--src/systemc/ext/dt/fx/sc_fxdefs.hh6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/systemc/ext/dt/fx/sc_fxdefs.hh b/src/systemc/ext/dt/fx/sc_fxdefs.hh
index 8acfabfa5..c72a45afc 100644
--- a/src/systemc/ext/dt/fx/sc_fxdefs.hh
+++ b/src/systemc/ext/dt/fx/sc_fxdefs.hh
@@ -50,6 +50,12 @@
#include "../../utils/sc_report_handler.hh"
#include "../int/sc_nbutils.hh"
+#if ULONG_MAX > 0xffffffffUL
+# define SC_LONG_64 1
+#else
+# define SC_LONG_64 0
+#endif
+
namespace sc_dt
{