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      1 # unistd_h.m4 serial 2
      2 dnl Copyright (C) 2006 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 dnl Written by Simon Josefsson
      8 
      9 AC_DEFUN([gl_HEADER_UNISTD],
     10 [
     11   dnl Prerequisites of lib/unistd.h.
     12   AC_CHECK_HEADERS([unistd.h], [
     13     UNISTD_H=''
     14   ], [
     15     UNISTD_H='unistd.h'
     16   ])
     17   AC_SUBST(UNISTD_H)
     18 ])
     19