[pkgsrc/trunk]: pkgsrc/net/ns Update ns to 2.27 and take maintainership.

To: pkgsrc-changes-hg%NetBSD.org@localhost
Subject: [pkgsrc/trunk]: pkgsrc/net/ns Update ns to 2.27 and take maintainership.
From: minskim <minskim%pkgsrc.org@localhost>
Date: Wed, 13 Oct 2021 23:41:39 +0000
details:   https://anonhg.NetBSD.org/pkgsrc/rev/15267b211ddb
branches:  trunk
changeset: 470400:15267b211ddb
user:      minskim <minskim%pkgsrc.org@localhost>
date:      Mon Mar 08 23:55:23 2004 +0000

description:
Update ns to 2.27 and take maintainership.

Changes:
  - Changed list-based improvement to allow changing of
  channels. Previously only a single (static) list of nodes
  maintained. Now list of nodes maintained for each channel. Maybe
  extended for mobilenodes with multiple netif (talking to multiple
  channels) once the multiple netif support is in place.
  - Added validation test-suite for RNG in ns.
  - Added modified version of setdest from U. of Michigan. Also added an
  argument to setdest API that defines the version of setdest being
  used.
  - Change the name of dumbPolicy to nullPolicy for consistency with
  diffserv documentations (suggested by Alexander Sayenko
  <sayenko%cc.jyu.fi@localhost>)
  - Added list-based improvement to ns-2. Code contributed by Valerie
  Naoumuv (naoumov%inf.ethz.ch@localhost). The improvement involves maintaining
  a doubly-linked list to organise mobilenodes based on their
  X-coordinates. When sending a packet only those neighbor nodes are
  considered who are within a circle corresponding to the
  carrier-sense threshold energy level, below which a node cannot hear
  the packet. Improvement on original version where all nodes in
  topology is considered. considerable gain in run-time performance-
  goes down by about 4 to 20 times, depending on the size of the
  topology. The larger the topology and greater the no of nodes,
  greater the improvement seen with the list-based implementation. Pl
  see relevant papaer "simulation of large adhoc networks", appeared
  at MSWiM'03, san diego, USA for details.
  - Added script <color-event.pl> that takes event/color pairs and
  colors pkts in nam output files in order to highlight nam events.
  - Modified ns to build with tcl/tk8.4 and new otcl/tclcl (release
  pending).
  - Diffusion documentation added to ns-manual.
  - Diffusion changes made includes (1)Added tcl example scripts for 2
  phase-pull, push, 1 phase-pull and gear (with push and 2pp)
  scenarios.  For gear and other node-position dependent routing in
  diffusion, need to have a callback to update node positions. since
  the routing filter (like gear) is init'ed before node positions are
  assigned gear doesn't get the correct node positions, hence the
  callback is required. callback would also be reqd to support node
  movements in diffusion in future.  For now start gear filters (in
  tcl scripts) after node positions are assigned to nodes. This will
  go away once callbacks are implemented.  (2)Added fix suggested by
  Andreas Koepke <koepke%ee.tu-berlin.de@localhost> for overflow problem in
  lib/main/tools.cc
  - Added worm model to support simulations of Internet worm attacks.
  This model supports different abstract levels in simulations.  It
  simulates a detailed sub-network at packet level, and the rest of
  the Internet with an analytical model (SIR). It supports two worm
  scanning behaviors: random and local-preferred.
  - Added event tracing function for simple-mac and 802.11.  It was
  contributed by <a href="mailto:singal%nunki.usc.edu@localhost";>Sushmita</a> to
  support wireless animations.
  - Added directory for nam animations under ns/tcl/edu. Each
  subdirecotry contains on animation, including short description,
  simulation script, trace file, and nam trace.  These animations are
  ready to use in classroom. The current three animations are
  contributed by Sushmita <singal%nunki.usc.edu@localhost> as the outcome of her
  directed research project.
  - Integrated support for infrastructure mode in 802.11 MAC. The code
  was was written by Mike Moreton
  - Fixed bug (reported by Fred Stann) in diffusion3 that caused
  overflow while reading time ( > 2147 sec).
  - New module Delayer for introducing delay variation and channel
  allocation delay.  This is useful for modeling the effects of
  wireless links.  Validation tests in "./test-all-links".  Code
  contributed by Andrei Gurtov.
  - Ported SCTP into ns-2. It was actually ported into ns-2.26 by
  Armando L. Caro Jr. <acaro@@cis.udel.edu> and his group at PEL, Univ
  of delaware. The implementation includes a test-suite-sctp and doc
  for sctp (see chapter on SCTP in ns-manual).
  - Added APIs for diffusion filters to node-config command. See
  tcl/ex/diffusion3 for examples. Also changed UIDs in common pkt
  hdr. It now reflects pkt_num_ as in diffusion message hdr.
  - Adding ts_resetRTO_ to TCP to control whether or not a
  timestamp-enabled sender unbacks a backed-off RTO after making a
  valid RTT measurement from an acknowledged, retransmitted packet.
  Validation tests are in "./test-all-tcpOptions" in "tcl/test":
  "./test-all-tcpOptions timeouts_sack2" (with ts_resetRTO_ true)
  "./test-all-tcpOptions timeouts_sack3" (with ts_resetRTO_ false).
  The suggestion and initial code for this change are from Andrei
  Gurtov.  Also adding exitFastRetrans_ to TCP, to fix a problem
  with clean exits from Fast Recovery.  Set to false for the old buggy
  behavior, or set to true for the new good behavior.  The default is
  true.  "./test-all-tcpOptions timeouts_reno_noexitFR" shows the old
  behavior, and: "./test-all-tcpOptions timeouts_reno" shows the fixed
  new behavior.  The problem was that data was sent in response to dup
  acks even after Fast Recovery was over.  From a bug report by Andrei
  Gurtov.
  - Improved portability for C++ namespaces
  (required for gcc-3.2 where the standard C++ libraries like iostream
  are in namespace stl only).
  - Added trace support for smac. The "mactype" info stored in
  simulator is used to trace data as well as mac pkts (smac or
  802.11).
  - Ported diffusion3.2.0 into ns. A lot of changes: all applications
  re-categorized under gear, ping and rmst. Filters have a separate
  dir. gradient now replaced with one-and two-phase-pull-filter under
  filter_core.
  - Changed the defaults for Agent/TCP/Newreno's newreno_changes1_ and
  partial_window_deflation_ to "1", to reflect RFC 2582.
  - Adding avoidReordering_ to DelayLink, set to true to avoid
  reordering when changing link bandwidth or delay.  The code was
  contributed by Andrei Gurtov, and the validation test is in
  ./test-all-links in the directory tcl/test.  The default is for
  avoidReordering_ to be false, for no change in past behavior.

diffstat:

 net/ns/Makefile         |    31 +-
 net/ns/distinfo         |    22 +-
 net/ns/patches/patch-aa |    10 +-
 net/ns/patches/patch-ab |     6 +-
 net/ns/patches/patch-ad |     6 +-
 net/ns/patches/patch-ae |     6 +-
 net/ns/patches/patch-af |  3733 ++++++++++++++++++++++++++++++++++++++++++++++-
 net/ns/patches/patch-al |    18 +-
 net/ns/patches/patch-am |    16 +-
 net/ns/patches/patch-ao |    16 +-
 10 files changed, 3782 insertions(+), 82 deletions(-)

diffs (truncated from 4050 to 300 lines):

diff -r a6af417c05ec -r 15267b211ddb net/ns/Makefile
--- a/net/ns/Makefile   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/Makefile   Mon Mar 08 23:55:23 2004 +0000
@@ -1,29 +1,43 @@
-# $NetBSD: Makefile,v 1.12 2004/03/08 20:27:15 minskim Exp $
+# $NetBSD: Makefile,v 1.13 2004/03/08 23:55:23 minskim Exp $
 
-DISTNAME=      ns-src-2.26
+DISTNAME=      ns-src-2.27
 PKGNAME=       ${DISTNAME:S/-src//}
-PKGREVISION=   1
 CATEGORIES=    net
 MASTER_SITES=  http://www.isi.edu/nsnam/dist/
 
-MAINTAINER=    tech-pkg%NetBSD.org@localhost
+MAINTAINER=    minskim%NetBSD.org@localhost
 HOMEPAGE=      http://www.isi.edu/nsnam/ns/
 COMMENT=       The UCB/LBNL Network Simulator Version 2
 
+PKG_INSTALLATION_TYPES=        overwrite pkgviews
+
 WRKSRC=                ${WRKDIR}/${DISTNAME:S/-src//}
+USE_BUILDLINK3=        yes
+USE_LANGUAGES= c c++
 GNU_CONFIGURE= yes
-USE_BUILDLINK2=        yes
 USE_X11=       yes
-PTHREAD_OPTS+=         require
+PTHREAD_OPTS+= require
 # Perl is only needed if you want to run the validation tests.
 #USE_PERL5=            build
 
 CONFIGURE_ARGS+=       --with-tcl=${BUILDLINK_PREFIX.tcl}
+CONFIGURE_ARGS+=       --with-tcl-ver=8.4
 CONFIGURE_ARGS+=       --with-tk=${BUILDLINK_PREFIX.tk}
+CONFIGURE_ARGS+=       --with-tk-ver=8.4
+CONFIGURE_ARGS+=       --with-otcl=${BUILDLINK_PREFIX.tcl-otcl}
 CONFIGURE_ARGS+=       --with-tclcl=${BUILDLINK_PREFIX.tcl-tclcl}
 
 MESSAGE_SUBST+=                HOMEPAGE=${HOMEPAGE}
 
+INSTALLATION_DIRS=     bin man/man1
+
+.include "../../devel/tcl-tclcl/buildlink3.mk"
+.include "../../lang/tcl/buildlink3.mk"
+.include "../../lang/tcl-otcl/buildlink3.mk"
+.include "../../net/libpcap/buildlink3.mk"
+.include "../../x11/tk83/buildlink3.mk"
+.include "../../mk/pthread.buildlink3.mk"
+
 # Remove a left over executable in the source tarball.
 post-extract:
        ${_PKG_SILENT}${_PKG_DEBUG}                     \
@@ -33,9 +47,4 @@
        ${INSTALL_DATA_DIR} ${PREFIX}/share/doc/html/ns
        ${INSTALL_DATA} ${WRKSRC}/CHANGES.html ${PREFIX}/share/doc/html/ns
 
-.include  "../../net/libpcap/buildlink2.mk"
-.include  "../../devel/tcl-tclcl/buildlink2.mk"
-.include  "../../lang/tcl-otcl/buildlink2.mk"
-.include "../../x11/tk83/buildlink2.mk"
-.include "../../mk/pthread.buildlink2.mk"
 .include "../../mk/bsd.pkg.mk"
diff -r a6af417c05ec -r 15267b211ddb net/ns/distinfo
--- a/net/ns/distinfo   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/distinfo   Mon Mar 08 23:55:23 2004 +0000
@@ -1,19 +1,19 @@
-$NetBSD: distinfo,v 1.4 2003/10/06 11:02:45 jlam Exp $
+$NetBSD: distinfo,v 1.5 2004/03/08 23:55:24 minskim Exp $
 
-SHA1 (ns-src-2.26.tar.gz) = 23da69b5e23356a14e4e1825b7f434731bdc5f68
-Size (ns-src-2.26.tar.gz) = 41592248 bytes
-SHA1 (patch-aa) = f9eae159453a3673feddc5e80c5bf2ff134b7d9c
-SHA1 (patch-ab) = 123d9110ac20063ffd32466dfa630bcbb76eff6d
+SHA1 (ns-src-2.27.tar.gz) = 63c3fbf6dd8772e9b0fa30b5127cc32da4b63e0c
+Size (ns-src-2.27.tar.gz) = 44642525 bytes
+SHA1 (patch-aa) = 49acbf12598245262286f0717b2b8efeb03792d2
+SHA1 (patch-ab) = 6c30337ed419553751eb8d1286e00c03ac0244b6
 SHA1 (patch-ac) = 28cda4d9f68e031725016d2c06925394c76e5152
-SHA1 (patch-ad) = 43dbf7d17c22c300ab3e9ea7057b1cd8ff805958
-SHA1 (patch-ae) = af6c1937b07d7328d8949f27f0821cec75f2dae7
-SHA1 (patch-af) = f82f3a56c73e1055516793d0a17484926aa38aab
+SHA1 (patch-ad) = 5f35152de976c2195dcff20abbe8610321dd9969
+SHA1 (patch-ae) = fb6a737a177447fd077fb4e70c51fa0f3bec9929
+SHA1 (patch-af) = d227406ec73324fd78bbe6314b47cc3950c2887e
 SHA1 (patch-ah) = 51c36d73309d135f89f7d2362835052b304b88bd
 SHA1 (patch-ai) = b75f36f986ca7c833769de09e6e79f6b87c5564a
 SHA1 (patch-aj) = 533fa4f1bd1f8bf83882ed5ed2717511283d5ddc
 SHA1 (patch-ak) = ea478696cdddc44ba7a76d1f31d4a6a97a88aaef
-SHA1 (patch-al) = 9ce53b51d15f51ab7d822e9cc75f42368690dd94
-SHA1 (patch-am) = 5901c5e880b58a84ea6dcbe5dfd442d8e4bb3fd1
+SHA1 (patch-al) = b305fc29f962d2bef8575afdbf3c401352fc57ea
+SHA1 (patch-am) = 298c41171cb7daa6b3a59287e9cb7a0ad37b6f44
 SHA1 (patch-an) = c5a672c47c554cd7a1970c732f1a9da76b6c7090
-SHA1 (patch-ao) = c21054375f00e4af77dd72b2bac2a734c64573e0
+SHA1 (patch-ao) = 7598b01a11352e602aa3e8013b518c656d6aae85
 SHA1 (patch-ap) = f59ca64a44c251104cd5cec173dbaad9c4e4756b
diff -r a6af417c05ec -r 15267b211ddb net/ns/patches/patch-aa
--- a/net/ns/patches/patch-aa   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/patches/patch-aa   Mon Mar 08 23:55:23 2004 +0000
@@ -1,8 +1,8 @@
-$NetBSD: patch-aa,v 1.3 2003/10/06 11:02:45 jlam Exp $
+$NetBSD: patch-aa,v 1.4 2004/03/08 23:55:24 minskim Exp $
 
---- Makefile.in.orig   Thu Jun  6 22:37:57 2002
+--- Makefile.in.orig   Mon Jan 12 18:59:20 2004
 +++ Makefile.in
-@@ -54,7 +54,7 @@
+@@ -54,7 +54,7 @@ PERL = @PERL@
  
  CCOPT = @V_CCOPT@
  STATIC        = @V_STATIC@
@@ -10,8 +10,8 @@
 +LDFLAGS       = @LDFLAGS@
  LDOUT = -o $(BLANK)
  
- DEFINE        = -DTCP_DELAY_BIND_ALL -DNO_TK @V_DEFINE@ @V_DEFINES@ @DEFS@ -DNS_DIFFUSION -DSMAC_NO_SYNC -DSTL_NAMESPACE=@STL_NAMESPACE@ -DUSE_SINGLE_ADDRESS_SPACE
-@@ -452,10 +452,10 @@
+ DEFINE        = -DTCP_DELAY_BIND_ALL -DNO_TK @V_DEFINE@ @V_DEFINES@ @DEFS@ -DNS_DIFFUSION -DSMAC_NO_SYNC -DCPP_NAMESPACE=@CPP_NAMESPACE@ -DUSE_SINGLE_ADDRESS_SPACE -Drng_test
+@@ -471,10 +471,10 @@ common/ptypes2tcl.o: common/ptypes2tcl.c
  install: force install-ns install-man install-recursive
  
  install-ns: force
diff -r a6af417c05ec -r 15267b211ddb net/ns/patches/patch-ab
--- a/net/ns/patches/patch-ab   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/patches/patch-ab   Mon Mar 08 23:55:23 2004 +0000
@@ -1,8 +1,8 @@
-$NetBSD: patch-ab,v 1.1.1.1 2002/08/27 08:07:07 seb Exp $
+$NetBSD: patch-ab,v 1.2 2004/03/08 23:55:24 minskim Exp $
 
---- autoconf.h.in.orig Mon Aug 14 15:57:14 2000
+--- autoconf.h.in.orig Mon Jan 12 18:59:20 2004
 +++ autoconf.h.in
-@@ -63,6 +63,9 @@
+@@ -66,6 +66,9 @@
  #undef HAVE_ARPA_INET_H
  #undef HAVE_NETINET_IN_H
  #undef HAVE_NET_ETHERNET_H
diff -r a6af417c05ec -r 15267b211ddb net/ns/patches/patch-ad
--- a/net/ns/patches/patch-ad   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/patches/patch-ad   Mon Mar 08 23:55:23 2004 +0000
@@ -1,6 +1,6 @@
-$NetBSD: patch-ad,v 1.1.1.1 2002/08/27 08:07:07 seb Exp $
+$NetBSD: patch-ad,v 1.2 2004/03/08 23:55:24 minskim Exp $
 
---- conf/configure.in.nse.orig Fri Sep 21 17:55:33 2001
+--- conf/configure.in.nse.orig Mon Jan 12 18:57:50 2004
 +++ conf/configure.in.nse
 @@ -11,7 +11,24 @@ dnl
  AC_MSG_CHECKING([for struct ether_header])
@@ -62,7 +62,7 @@
  #include <netinet/tcp.h>
  ], [
  int main()
-@@ -120,7 +157,6 @@ dnl
+@@ -140,7 +177,6 @@ dnl
  dnl  Check for pcap library 
  dnl
  AC_CHECK_LIB(pcap,main,[V_LIB="$V_LIB -lpcap" pcap=yes])
diff -r a6af417c05ec -r 15267b211ddb net/ns/patches/patch-ae
--- a/net/ns/patches/patch-ae   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/patches/patch-ae   Mon Mar 08 23:55:23 2004 +0000
@@ -1,8 +1,8 @@
-$NetBSD: patch-ae,v 1.1.1.1 2002/08/27 08:07:07 seb Exp $
+$NetBSD: patch-ae,v 1.2 2004/03/08 23:55:24 minskim Exp $
 
---- configure.in.orig  Mon Sep 24 17:48:42 2001
+--- configure.in.orig  Mon Jan 12 18:59:18 2004
 +++ configure.in
-@@ -36,7 +36,7 @@ AC_HEADER_STDC
+@@ -37,7 +37,7 @@ AC_HEADER_STDC
  
  dnl AC_CHECK_FUNCS will place -D's in @DEFS@
  AC_CHECK_FUNCS(bcopy bzero fesetprecision getrusage sbrk snprintf)
diff -r a6af417c05ec -r 15267b211ddb net/ns/patches/patch-af
--- a/net/ns/patches/patch-af   Mon Mar 08 23:49:41 2004 +0000
+++ b/net/ns/patches/patch-af   Mon Mar 08 23:55:23 2004 +0000
@@ -1,8 +1,1636 @@
-$NetBSD: patch-af,v 1.3 2003/09/03 13:42:45 seb Exp $
+$NetBSD: patch-af,v 1.4 2004/03/08 23:55:24 minskim Exp $
 
---- configure.orig     Sat Apr 13 00:34:24 2002
+--- configure.orig     2004-03-08 17:19:35.000000000 -0600
 +++ configure
-@@ -2939,7 +2939,7 @@
+@@ -1,9 +1,8 @@
+ #! /bin/sh
+ # Guess values for system-dependent variables and create Makefiles.
+-# Generated by GNU Autoconf 2.57.
++# Generated by GNU Autoconf 2.59.
+ #
+-# Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
+-# Free Software Foundation, Inc.
++# Copyright (C) 2003 Free Software Foundation, Inc.
+ # This configure script is free software; the Free Software Foundation
+ # gives unlimited permission to copy, distribute and modify it.
+ ## --------------------- ##
+@@ -20,9 +19,10 @@ if test -n "${ZSH_VERSION+set}" && (emul
+ elif test -n "${BASH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
+   set -o posix
+ fi
++DUALCASE=1; export DUALCASE # for MKS sh
+ 
+ # Support unset when possible.
+-if (FOO=FOO; unset FOO) >/dev/null 2>&1; then
++if ( (MAIL=60; unset MAIL) || exit) >/dev/null 2>&1; then
+   as_unset=unset
+ else
+   as_unset=false
+@@ -41,7 +41,7 @@ for as_var in \
+   LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER \
+   LC_TELEPHONE LC_TIME
+ do
+-  if (set +x; test -n "`(eval $as_var=C; export $as_var) 2>&1`"); then
++  if (set +x; test -z "`(eval $as_var=C; export $as_var) 2>&1`"); then
+     eval $as_var=C; export $as_var
+   else
+     $as_unset $as_var
+@@ -218,16 +218,17 @@ rm -f conf$$ conf$$.exe conf$$.file
+ if mkdir -p . 2>/dev/null; then
+   as_mkdir_p=:
+ else
++  test -d ./-p && rmdir ./-p
+   as_mkdir_p=false
+ fi
+ 
+ as_executable_p="test -f"
+ 
+ # Sed expression to map a string onto a valid CPP name.
+-as_tr_cpp="sed y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g"
++as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
+ 
+ # Sed expression to map a string onto a valid variable name.
+-as_tr_sh="sed y%*+%pp%;s%[^_$as_cr_alnum]%_%g"
++as_tr_sh="eval sed 'y%*+%pp%;s%[^_$as_cr_alnum]%_%g'"
+ 
+ 
+ # IFS
+@@ -667,7 +668,7 @@ done
+ 
+ # Be sure to have absolute paths.
+ for ac_var in bindir sbindir libexecdir datadir sysconfdir sharedstatedir \
+-              localstatedir libdir includedir oldincludedir infodir mandir
++            localstatedir libdir includedir oldincludedir infodir mandir
+ do
+   eval ac_val=$`echo $ac_var`
+   case $ac_val in
+@@ -707,10 +708,10 @@ if test -z "$srcdir"; then
+   # Try the directory containing this script, then its parent.
+   ac_confdir=`(dirname "$0") 2>/dev/null ||
+ $as_expr X"$0" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+-         X"$0" : 'X\(//\)[^/]' \| \
+-         X"$0" : 'X\(//\)$' \| \
+-         X"$0" : 'X\(/\)' \| \
+-         .     : '\(.\)' 2>/dev/null ||
++       X"$0" : 'X\(//\)[^/]' \| \
++       X"$0" : 'X\(//\)$' \| \
++       X"$0" : 'X\(/\)' \| \
++       .     : '\(.\)' 2>/dev/null ||
+ echo X"$0" |
+     sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
+         /^X\(\/\/\)[^/].*/{ s//\1/; q; }
+@@ -810,9 +811,9 @@ _ACEOF
+   cat <<_ACEOF
+ Installation directories:
+   --prefix=PREFIX         install architecture-independent files in PREFIX
+-                          [$ac_default_prefix]
++                        [$ac_default_prefix]
+   --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+-                          [PREFIX]
++                        [PREFIX]
+ 
+ By default, \`make install' will install all the files in
+ \`$ac_default_prefix/bin', \`$ac_default_prefix/lib' etc.  You can specify
+@@ -921,12 +922,45 @@ case $srcdir in
+     ac_srcdir=$ac_top_builddir$srcdir$ac_dir_suffix
+     ac_top_srcdir=$ac_top_builddir$srcdir ;;
+ esac
+-# Don't blindly perform a `cd "$ac_dir"/$ac_foo && pwd` since $ac_foo can be
+-# absolute.
+-ac_abs_builddir=`cd "$ac_dir" && cd $ac_builddir && pwd`
+-ac_abs_top_builddir=`cd "$ac_dir" && cd ${ac_top_builddir}. && pwd`
+-ac_abs_srcdir=`cd "$ac_dir" && cd $ac_srcdir && pwd`
+-ac_abs_top_srcdir=`cd "$ac_dir" && cd $ac_top_srcdir && pwd`
++
++# Do not use `cd foo && pwd` to compute absolute paths, because
++# the directories may not exist.
++case `pwd` in
++.) ac_abs_builddir="$ac_dir";;
++*)
++  case "$ac_dir" in
++  .) ac_abs_builddir=`pwd`;;
++  [\\/]* | ?:[\\/]* ) ac_abs_builddir="$ac_dir";;
++  *) ac_abs_builddir=`pwd`/"$ac_dir";;
++  esac;;
++esac
++case $ac_abs_builddir in
++.) ac_abs_top_builddir=${ac_top_builddir}.;;
++*)
++  case ${ac_top_builddir}. in
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