INN makes extensive use the writev system call to write several I/O
buffers  in a single call.  If you do not have writev then you must copy
include/uio.h to your /usr/include/sys directory.   You  must  also  add
``writev.c''   and  ``writev.o''  to  the  MISSING_SRC  and  MISSING_OBJ
parameters.

     The ``fake'' writev found  in  the  lib  directory  is  not  highly
efficient.   You might want to write a better one that tries to malloc a
new buffer and join all the  elements.   Be  careful  about  doing  this
because innd can use very big buffers.