need types.h for size_t as pointed out in buildlog

libpthread/linuxthreads.old/sysdeps/ia64/pt-machine.h

@@ -23,6 +23,7 @@
 
 #include <ia64intrin.h>
 
+#include <sys/types.h>
 extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
                      size_t __child_stack_size, int __flags, void *__arg, ...);