| 1 | # unistd_h.m4 serial 4
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| 2 | dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Written by Simon Josefsson
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| 8 |
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| 9 | AC_DEFUN([gl_HEADER_UNISTD],
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| 10 | [
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| 11 | dnl Use AC_REQUIRE here, so that the default behavior below is expanded
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| 12 | dnl once only, before all statements that occur in other macros.
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| 13 | AC_REQUIRE([gl_HEADER_UNISTD_DEFAULTS])
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| 14 |
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| 15 | AC_CHECK_HEADERS([unistd.h], [], [
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| 16 | UNISTD_H='unistd.h'
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| 17 | ])
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| 18 | dnl This module decides to build unistd.h if it is missing.
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| 19 | dnl The fchdir module decides to build unistd.h if fchdir() is missing.
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| 20 | dnl Therefore check for the prerequisites of lib/unistd.h always.
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| 21 | gl_PREREQ_UNISTD
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| 22 | ])
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| 23 |
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| 24 | dnl Prerequisites of lib/unistd.h.
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| 25 | AC_DEFUN([gl_PREREQ_UNISTD],
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| 26 | [
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| 27 | AC_CHECK_HEADERS_ONCE([unistd.h])
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| 28 | if test $ac_cv_header_unistd_h = yes; then
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| 29 | gl_ABSOLUTE_HEADER([unistd.h])
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| 30 | ABSOLUTE_UNISTD_H=\"$gl_cv_absolute_unistd_h\"
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| 31 | fi
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| 32 | AC_SUBST([ABSOLUTE_UNISTD_H])
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| 33 | ])
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| 34 |
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| 35 | AC_DEFUN([gl_HEADER_UNISTD_DEFAULTS],
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| 36 | [
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| 37 | UNISTD_H=
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| 38 | AC_SUBST(UNISTD_H)
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| 39 | ])
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