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-rw-r--r--src/3rdparty/autotrace/epsilon-equal.h17
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diff --git a/src/3rdparty/autotrace/epsilon-equal.h b/src/3rdparty/autotrace/epsilon-equal.h
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+++ b/src/3rdparty/autotrace/epsilon-equal.h
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+/* epsilon-equal.h: define an error resist compare. */
+
+#ifndef EPSILON_EQUAL_H
+#define EPSILON_EQUAL_H
+
+#include "types.h"
+
+/* Says whether V1 and V2 are within REAL_EPSILON of each other.
+ Fixed-point arithmetic would be better, to guarantee machine
+ independence, but it's so much more painful to work with. The value
+ here is smaller than can be represented in either a `fix_word' or a
+ `scaled_num', so more precision than this will be lost when we
+ output, anyway. */
+extern gboolean epsilon_equal(gfloat v1, gfloat v2);
+#define REAL_EPSILON 0.00001
+
+#endif /* not EPSILON_EQUAL_H */