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-From edd44df686b4ec983a327cabc5035106addb274f Mon Sep 17 00:00:00 2001
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-From: Carlos Santos <unixmania@gmail.com>
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-Date: Mon, 16 Sep 2019 22:22:37 -0300
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-Subject: [PATCH] install: support old ln versions without the -r option
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-
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-Oldish enterprise-class Linux distributions have outdated versions of
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-coreutils whose ln command do not support the -r option. Also non-Linux
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-systems like FreeBSD don't support that option. Use a shell script that
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-mimics the missing functionality.
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-
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-The script creates minimalist relative paths, like ln -r does, but in
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-order to simplify the logic, it requires that the arguments be absolute
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-paths and do not end with '/'. This is enough for our purposes.
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-
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-Add configuration logic to detect if ln supports the -r option, based on
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-the logic used by Autoconf to check if ln supports the -s option.
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-
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-Signed-off-by: Carlos Santos <unixmania@gmail.com>
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----
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- Makefile.am | 6 ++--
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- configure.ac | 2 ++
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- ln-srf | 49 ++++++++++++++++++++++++++
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- m4/ac_ln_srf.m4 | 91 +++++++++++++++++++++++++++++++++++++++++++++++++
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- 4 files changed, 145 insertions(+), 3 deletions(-)
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- create mode 100755 ln-srf
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- create mode 100644 m4/ac_ln_srf.m4
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-
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-diff --git a/Makefile.am b/Makefile.am
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-index 76b81de5..beb2882e 100644
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---- a/Makefile.am
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-+++ b/Makefile.am
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-@@ -988,11 +988,11 @@ install-exec-hook:
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- $(INSTALL) -d -m 755 $(DESTDIR)$(pkgfilterdir)
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- $(INSTALL) -d -m 755 $(DESTDIR)$(pkgbackenddir)
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- if ENABLE_FOOMATIC
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-- $(LN_S) -r -f $(DESTDIR)$(pkgfilterdir)/foomatic-rip $(DESTDIR)$(bindir)
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-+ $(LN_SRF) $(DESTDIR)$(pkgfilterdir)/foomatic-rip $(DESTDIR)$(bindir)
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- endif
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- if ENABLE_DRIVERLESS
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-- $(LN_S) -r -f $(DESTDIR)$(pkgppdgendir)/driverless $(DESTDIR)$(bindir)
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-- $(LN_S) -r -f $(DESTDIR)$(pkgppdgendir)/driverless $(DESTDIR)$(pkgbackenddir)
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-+ $(LN_SRF) $(DESTDIR)$(pkgppdgendir)/driverless $(DESTDIR)$(bindir)
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-+ $(LN_SRF) $(DESTDIR)$(pkgppdgendir)/driverless $(DESTDIR)$(pkgbackenddir)
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- endif
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- if ENABLE_BRAILLE
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- $(LN_S) -f imagetobrf $(DESTDIR)$(pkgfilterdir)/imagetoubrl
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-diff --git a/configure.ac b/configure.ac
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-index d5a539b6..fbcf829a 100644
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---- a/configure.ac
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-+++ b/configure.ac
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-@@ -58,6 +58,8 @@ AM_ICONV
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- AC_PROG_CPP
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- AC_PROG_INSTALL
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- AC_PROG_LN_S
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-+AS_LN_SRF_PREPARE
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-+AC_PROG_LN_SRF
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- AC_PROG_MAKE_SET
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- AC_PROG_LIBTOOL
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- PKG_PROG_PKG_CONFIG([0.20])
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-diff --git a/ln-srf b/ln-srf
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-new file mode 100755
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-index 00000000..f395a760
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---- /dev/null
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-+++ b/ln-srf
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-@@ -0,0 +1,49 @@
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-+#!/bin/sh
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-+#
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-+# Author: Carlos Santos <unixmania@gmail.com>
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-+# This file is in public domain.
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-+#
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-+
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-+error() {
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-+ echo "$@" 1>&2
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-+ exit 1
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-+}
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-+
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-+src="$1"
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-+dst="$2"
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-+
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-+check_path() {
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-+ case "$2" in
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-+ */../*|*/./*|*/.|*/..) error "$1 path '$2' must be absolute";;
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-+ */) error "$1 path '$2' must not end with '/'";;
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-+ /?*) ;;
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-+ *) error "$1 path '$2' must start with '/'";;
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-+ esac
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-+}
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-+
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-+check_path "source" "$src"
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-+check_path "destination" "$dst"
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-+
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-+# strip leading '/'
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-+src=${src#/*}
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-+tmp=${dst#/*}
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-+
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-+s_prefix=${src%%/*}
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-+d_prefix=${tmp%%/*}
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-+
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-+# strip leading common
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-+while [ "$s_prefix" = "$d_prefix" ]; do
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-+ src="${src#$s_prefix/}"
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-+ tmp="${tmp#$d_prefix/}"
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-+ s_prefix=${src%%/*}
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-+ d_prefix=${tmp%%/*}
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-+done
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-+
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-+s_prefix="../"
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-+while [ -n "$d_prefix" ] && [ "$tmp" != "$d_prefix" ]; do
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-+ s_prefix="../$s_prefix"
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-+ tmp="${tmp#$d_prefix/}"
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-+ d_prefix=${tmp%%/*}
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-+done
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-+
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-+ln -s -f "$s_prefix$src" "$dst"
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-diff --git a/m4/ac_ln_srf.m4 b/m4/ac_ln_srf.m4
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-new file mode 100644
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-index 00000000..204b3439
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---- /dev/null
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-+++ b/m4/ac_ln_srf.m4
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-@@ -0,0 +1,91 @@
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-+# Adapted from Autoconf Version 2.63 (GPLv2).
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-+#
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-+# Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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-+# Free Software Foundation, Inc.
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-+#
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-+# This program is free software: you can redistribute it and/or modify
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-+# it under the terms of the GNU General Public License as published by
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-+# the Free Software Foundation; either version 2, or (at your option)
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-+# any later version.
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-+#
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-+# This program is distributed in the hope that it will be useful,
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-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-+# GNU General Public License for more details.
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-+#
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-+# You should have received a copy of the GNU General Public License
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-+# along with this program; if not, write to the Free Software
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-+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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-+# 02110-1301, USA.
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-+#
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-+# As a special exception, the Free Software Foundation gives unlimited
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-+# permission to copy, distribute and modify the configure scripts that
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-+# are the output of Autoconf. You need not follow the terms of the GNU
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-+# General Public License when using or distributing such scripts, even
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-+# though portions of the text of Autoconf appear in them. The GNU
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-+# General Public License (GPL) does govern all other use of the material
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-+# that constitutes the Autoconf program.
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-+#
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-+# Certain portions of the Autoconf source text are designed to be copied
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-+# (in certain cases, depending on the input) into the output of
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-+# Autoconf. We call these the "data" portions. The rest of the Autoconf
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-+# source text consists of comments plus executable code that decides which
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-+# of the data portions to output in any given case. We call these
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-+# comments and executable code the "non-data" portions. Autoconf never
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-+# copies any of the non-data portions into its output.
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-+#
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-+# This special exception to the GPL applies to versions of Autoconf
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-+# released by the Free Software Foundation. When you make and
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-+# distribute a modified version of Autoconf, you may extend this special
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-+# exception to the GPL to apply to your modified version as well, *unless*
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-+# your modified version has the potential to copy into its output some
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-+# of the text that was the non-data portion of the version that you started
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-+# with. (In other words, unless your change moves or copies text from
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-+# the non-data portions to the data portions.) If your modification has
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-+# such potential, you must delete any notice of this special exception
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-+# to the GPL from your modified version.
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-+
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-+# AS_LN_SRF_PREPARE
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-+# ------------------------------------
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-+m4_defun([AS_LN_SRF_PREPARE],
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-+[rm -f conf$$ conf$$.exe conf$$.file
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-+if test -d conf$$.dir; then
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-+ rm -f conf$$.dir/conf$$.file
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-+else
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-+ rm -f conf$$.dir
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-+ mkdir conf$$.dir 2>/dev/null
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-+fi
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-+if (echo >conf$$.file) 2>/dev/null; then
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-+ if ln -s -r conf$$.file conf$$ 2>/dev/null; then
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-+ as_ln_srf='ln -s -r -f'
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-+ elif ln -s conf$$.file conf$$ 2>/dev/null; then
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-+ as_ln_srf='./ln-srf'
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-+ # ... but there are two gotchas:
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-+ # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
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-+ # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
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-+ # In both cases, we have to default to `cp -pRf'.
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-+ ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
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-+ as_ln_srf='cp -pRf'
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-+ elif ln conf$$.file conf$$ 2>/dev/null; then
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-+ as_ln_srf=ln
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-+ else
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-+ as_ln_srf='cp -pRf'
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-+ fi
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-+else
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-+ as_ln_srf='cp -pRf'
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-+fi
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-+rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
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-+rmdir conf$$.dir 2>/dev/null
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-+])# AS_LN_SRF_PREPARE
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-+
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-+# AC_PROG_LN_SRF
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-+# --------------------------------
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-+AC_DEFUN([AC_PROG_LN_SRF],
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-+[AC_MSG_CHECKING([whether ln -s -r -f works])
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-+AC_SUBST([LN_SRF], [$as_ln_srf])dnl
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-+if test "$LN_SRF" = "ln -s -r -f"; then
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-+ AC_MSG_RESULT([yes])
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-+else
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-+ AC_MSG_RESULT([no, using $LN_SRF])
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-+fi
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-+])# AC_PROG_LN_SRF
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---
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-2.18.1
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-
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