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diff --git a/ext/fputils/include/fputils/fp64.h b/ext/fputils/include/fputils/fp64.h
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+++ b/ext/fputils/include/fputils/fp64.h
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+/*
+ * Copyright (c) 2014, Andreas Sandberg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _FP64_H
+#define _FP64_H 1
+
+#include <fputils/fptypes.h>
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @defgroup fp64 64-bit Floats
+ * Functions handling 64-bit floats.
+ *
+ * @{
+ */
+
+
+/** Constant representing +inf */
+extern const fp64_t fp64_pinf;
+/** Constant representing -inf */
+extern const fp64_t fp64_ninf;
+
+/** Constant representing a quiet NaN */
+extern const fp64_t fp64_qnan;
+/** Constant representing a negative quiet NaN */
+extern const fp64_t fp64_nqnan;
+/** Constant representing a quiet indefinite NaN */
+extern const fp64_t fp64_qnani;
+/** Constant representing a signaling NaN */
+extern const fp64_t fp64_snan;
+/** Constant representing a negative signaling NaN */
+extern const fp64_t fp64_nsnan;
+
+/** Alias for fp64_qnan */
+extern const fp64_t fp64_nan;
+
+/** @} */
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+#endif