+#ifdef __GLIBC__
+#include <endian.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define PIPE_ARCH_LITTLE_ENDIAN
+#elif __BYTE_ORDER == __BIG_ENDIAN
+# define PIPE_ARCH_BIG_ENDIAN
+#endif
+
+#elif defined(__APPLE__)
+#include <machine/endian.h>
+
+#if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
+# define PIPE_ARCH_LITTLE_ENDIAN
+#elif __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN
+# define PIPE_ARCH_BIG_ENDIAN
+#endif
+
+#elif defined(__sun)
+#include <sys/isa_defs.h>
+
+#if defined(_LITTLE_ENDIAN)
+# define PIPE_ARCH_LITTLE_ENDIAN
+#elif defined(_BIG_ENDIAN)
+# define PIPE_ARCH_BIG_ENDIAN
+#endif
+
+#elif defined(__OpenBSD__) || defined(__NetBSD__)
+#include <sys/types.h>
+#include <machine/endian.h>
+
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+# define PIPE_ARCH_LITTLE_ENDIAN
+#elif _BYTE_ORDER == _BIG_ENDIAN
+# define PIPE_ARCH_BIG_ENDIAN
+#endif
+
+#else
+
+#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64) || defined(PIPE_ARCH_ARM) || defined(PIPE_ARCH_AARCH64)