Linux >= 63489
Linux/SPARC >= 126977
+ Linux/IA-64 >= 253953
FreeBSD, OpenBSD, MacOS X >= 65537
AIX >= 32769
HP-UX >= 8193
Cygwin >= 65537
native Win32 >= 4097 (depends on the _pipe argument)
*/
-#if defined __osf__
+#if defined __osf__ || (defined __linux__ && defined __ia64__)
# define PIPE_DATA_BLOCK_SIZE 270000
#elif defined __linux__ && defined __sparc__
# define PIPE_DATA_BLOCK_SIZE 140000