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-rw-r--r--include/types.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/types.h b/include/types.h
index 1227a4db..0dbd6118 100644
--- a/include/types.h
+++ b/include/types.h
@@ -1,3 +1,6 @@
+#ifndef URWEB_TYPES_H
+#define URWEB_TYPES_H
+
#include <time.h>
typedef long long uw_Basis_int;
@@ -42,3 +45,4 @@ typedef struct input *uw_input;
#define FLOATS_MAX 100
#define TIMES_MAX 100
+#endif