1# unistd_h.m4 serial 2 2dnl Copyright (C) 2006 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl Written by Simon Josefsson 8 9AC_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