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hurd-i386 does not define IOV_MAX
--- a/src/include/port/pg_iovec.h
+++ b/src/include/port/pg_iovec.h
@@ -20,9 +20,6 @@
#else
-/* POSIX requires at least 16 as a maximum iovcnt. */
-#define IOV_MAX 16
-
/* Define our own POSIX-compatible iovec struct. */
struct iovec
{
@@ -32,6 +29,11 @@ struct iovec
#endif
+/* POSIX requires at least 16 as a maximum iovcnt. */
+#ifndef IOV_MAX
+#define IOV_MAX 16
+#endif
+
/* Define a reasonable maximum that is safe to use on the stack. */
#define PG_IOV_MAX Min(IOV_MAX, 32)
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