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diff --git a/math_private.h b/math_private.h
--- a/math_private.h
+++ b/math_private.h
@@ -20,16 +20,24 @@
#include <cfloat>
#include <stdint.h>
#include <sys/types.h>
#include "mozilla/EndianUtils.h"
#include "fdlibm.h"
+/*
+ * Emulate FreeBSD internal double types.
+ * Adapted from https://github.com/freebsd/freebsd-src/search?q=__double_t
+ */
+
+typedef double __double_t;
+typedef __double_t double_t;
+
/*
* The original fdlibm code used statements like:
* n0 = ((*(int*)&one)>>29)^1; * index of high word *
* ix0 = *(n0+(int*)&x); * high word of x *
* ix1 = *((1-n0)+(int*)&x); * low word of x *
* to dig two 32 bit words out of the 64 bit IEEE floating point
* value. That is non-ANSI, and, moreover, the gcc instruction
* scheduler gets it wrong. We instead use the following macros.
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