source: xsoft/graphweb/firefox.xml@ a57b443

10.1 11.0 11.1 11.2 lazarus plabs/python-mods qt5new trunk upgradedb xry111/intltool xry111/soup3 xry111/test-20220226
Last change on this file since a57b443 was a57b443, checked in by Bruce Dubbs <bdubbs@…>, 22 months ago

Tags and a minor format change.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@24303 af4574ff-66df-0310-9fd7-8a98e5e911e0

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6
7 <!ENTITY firefox-download-http "&mozilla-http;/firefox/releases/&firefox-version;esr/source/firefox-&firefox-version;esr.source.tar.xz">
8 <!ENTITY firefox-download-ftp " ">
9 <!ENTITY firefox-md5sum "04858eb8431d560e62189878d1abb7bd">
10 <!ENTITY firefox-size "316 MB">
11 <!-- NB with stylo, much of the build uses rust, and therefore cargo files.
12 But the extra cached cargo files, if any, seem to be minimal -->
13 <!ENTITY firefox-buildsize "5.1 GB (185 MB installed) without tests">
14 <!-- editors: with ff63 and rust-1.29, ./mach build -j4 is probably the
15 most practical way to get a timing on a machine with more cores, if taking
16 cores offline is not practical. If in doubt, round up -->
17 <!ENTITY firefox-time "27 SBU (on a 4-core machine) without tests">
18]>
19
20<sect1 id="firefox" xreflabel="Firefox-&firefox-version;">
21 <?dbhtml filename="firefox.html" ?>
22
23 <sect1info>
24 <othername>$LastChangedBy$</othername>
25 <date>$Date$</date>
26 </sect1info>
27
28 <title>Firefox-&firefox-version;</title>
29
30 <indexterm zone="firefox">
31 <primary sortas="a-Firefox">Firefox</primary>
32 </indexterm>
33
34 <sect2 role="package">
35 <title>Introduction to Firefox</title>
36
37 <para>
38 <application>Firefox</application> is a stand-alone browser based on the
39 <application>Mozilla</application> codebase.
40 </para>
41
42 &lfs101_checked;
43
44 <bridgehead renderas="sect3">Package Information</bridgehead>
45 <itemizedlist spacing="compact">
46 <listitem>
47 <para>
48 Download (HTTP): <ulink url="&firefox-download-http;"/>
49 </para>
50 </listitem>
51 <listitem>
52 <para>
53 Download (FTP): <ulink url="&firefox-download-ftp;"/>
54 </para>
55 </listitem>
56 <listitem>
57 <para>
58 Download MD5 sum: &firefox-md5sum;
59 </para>
60 </listitem>
61 <listitem>
62 <para>
63 Download size: &firefox-size;
64 </para>
65 </listitem>
66 <listitem>
67 <para>
68 Estimated disk space required: &firefox-buildsize;
69 </para>
70 </listitem>
71 <listitem>
72 <para>
73 Estimated build time: &firefox-time;
74 </para>
75 </listitem>
76 </itemizedlist>
77
78<!--<bridgehead renderas="sect3">Additional Downloads</bridgehead>
79 <itemizedlist spacing="compact">
80 <listitem>
81 <para>
82 Required patch:
83 <ulink url="&patch-root;/firefox-&firefox-version;esr-rustc1470-1.patch"/>
84 </para>
85 </listitem>
86 </itemizedlist>-->
87
88 <note>
89 <para>
90 The directory name is firefox-&firefox-version;
91 </para>
92
93 <para>
94 Extracting the tarball
95 will reset the permissions of the current directory to 0755 if you
96 have permission to do that. If you do this in a directory where
97 the sticky bit is set, such
98 as <filename class="directory">/tmp</filename> it will end with error
99 messages:
100 </para>
101
102<literallayout>tar: .: Cannot utime: Operation not permitted
103tar: .: Cannot change mode to rwxr-xr-t: Operation not permitted
104tar: Exiting with failure status due to previous errors
105</literallayout>
106
107 <para>
108 This does finish with non-zero status, but it does
109 <emphasis>NOT</emphasis> mean there is a real problem.
110 Do not untar as the <systemitem class="username">root</systemitem> user
111 in a directory where the sticky bit is set - that will unset it.
112 </para>
113
114 <para>
115 As with other large packages which use C++ (or rust), the SBU times
116 to build this vary more widely than you might expect. The build times
117 will increase significantly if your machine has to swap.
118 </para>
119
120 <!-- commented, by 78.0 it seems to work reliably
121 <para>
122 The mach build system (Python scripts) can be somewhat unreliable: if
123 the build fails and reports an Error, it can still return a status of
124 success, causing a scripted build to try to install (which does not rerun
125 the build), fail during the preparations for installing, but still exit
126 with a status of success. Also, on occasion it may limit itself to only
127 running one set of jobs - that will make the build take about 3 times as
128 long as running with four sets of jobs.
129 </para>-->
130
131 <para>
132 Although upstream prefer to use <application>PulseAudio</application>,
133 for the moment <application>Alsa</application> can still be used. Both
134 may need runtime configuration to get sound working.
135 </para>
136 </note>
137
138 <bridgehead renderas="sect3">Firefox Dependencies</bridgehead>
139
140 <bridgehead renderas="sect4">Required</bridgehead>
141 <para role="required">
142 <xref linkend="autoconf213"/>,
143 <xref linkend="cbindgen"/>,
144 <xref linkend="dbus-glib"/>,
145 both <xref linkend="gtk3"/> and
146 <xref linkend="gtk2"/>,
147 <xref linkend="libnotify"/>,
148 <xref linkend="llvm"/> (clang, used for bindgen even if using gcc),
149 <xref linkend="nodejs"/>,
150 <xref linkend="nss"/>,
151 <xref linkend="pulseaudio"/>
152 (or
153 <xref linkend="alsa-lib"/> if you edit the mozconfig;
154 now deprecated by mozilla), in either case please read the
155 Configuration Information,
156 <!-- rustc is required by cbindgen so not needed here
157 <xref linkend="rust"/>,-->
158 <xref linkend="python3"/> (rebuilt after installing <xref linkend="sqlite"/>),
159 <xref linkend="startup-notification"/>,
160 <xref linkend="unzip"/>,
161 <xref linkend="yasm"/>, and
162 <xref linkend="zip"/>
163 </para>
164
165 <bridgehead renderas="sect4">Recommended</bridgehead>
166 <para role="recommended">
167 <xref linkend="icu"/>,
168 <xref linkend="libevent"/>,
169 <xref linkend="libwebp"/>,
170 <xref linkend="nasm"/>
171 </para>
172
173 <note>
174 <para>
175 If you don't install recommended dependencies, then internal copies of
176 those packages will be used. They might be tested to work, but they can
177 be out of date or contain security holes.
178 </para>
179 </note>
180
181 <bridgehead renderas="sect4">Optional</bridgehead>
182 <para role="optional">
183 <xref linkend="curl"/>,
184 <xref linkend="doxygen"/>,
185 <xref role="runtime" linkend="ffmpeg"/> (runtime, to play mov, mp3 or mp4 files),
186 <!-- <phrase revision="sysv"><ulink url="http://sourceforge.net/projects/liboauth/files/">liboauth</ulink></phrase> -->
187 <xref linkend="liboauth"/>,
188 <xref linkend="openjdk"/>,
189 <xref linkend="valgrind"/>,
190 <xref linkend="wget"/>,
191 <xref linkend="wireless_tools"/>,
192 <ulink url="https://github.com/libproxy/libproxy">libproxy</ulink>
193 </para>
194
195 <para condition="html" role="usernotes">
196 User Notes: <ulink url="&blfs-wiki;/firefox"/>
197 </para>
198 </sect2>
199
200 <sect2 role="installation">
201 <title>Installation of Firefox</title>
202
203 <para>
204 The configuration of <application>Firefox</application> is accomplished
205 by creating a <filename>mozconfig</filename> file containing the desired
206 configuration options. A default <filename>mozconfig</filename> is
207 created below. To see the entire list of available configuration options
208 (and an abbreviated description of some of them), issue <command>./mach
209 configure &amp;&amp; ./configure --help | less</command>. You may also
210 wish to review the entire file and uncomment any other desired options.
211 Create the file by issuing the following command:
212 </para>
213
214<screen><userinput>cat &gt; mozconfig &lt;&lt; "EOF"
215<literal># If you have a multicore machine, all cores will be used by default.
216
217# If you have installed (or will install) wireless-tools, and you wish
218# to use geolocation web services, comment out this line
219ac_add_options --disable-necko-wifi
220
221# API Keys for geolocation APIs - necko-wifi (above) is required for MLS
222# Uncomment the following line if you wish to use Mozilla Location Service
223#ac_add_options --with-mozilla-api-keyfile=$PWD/mozilla-key
224
225# Uncomment the following line if you wish to use Google's geolocaton API
226# (needed for use with saved maps with Google Maps)
227#ac_add_options --with-google-location-service-api-keyfile=$PWD/google-key
228
229# startup-notification is required since firefox-78
230
231# Uncomment the following option if you have not installed PulseAudio
232#ac_add_options --disable-pulseaudio
233# or uncomment this if you installed alsa-lib instead of PulseAudio
234#ac_add_options --enable-alsa
235
236# Comment out following options if you have not installed
237# recommended dependencies:
238ac_add_options --with-system-libevent
239ac_add_options --with-system-webp
240ac_add_options --with-system-nspr
241ac_add_options --with-system-nss
242ac_add_options --with-system-icu
243
244# Do not specify the gold linker which is not the default. It will take
245# longer and use more disk space when debug symbols are disabled.
246
247# libdavid (av1 decoder) requires nasm. Uncomment this if nasm
248# has not been installed.
249#ac_add_options --disable-av1
250
251# You cannot distribute the binary if you do this
252ac_add_options --enable-official-branding
253
254# Stripping is now enabled by default.
255# Uncomment these lines if you need to run a debugger:
256#ac_add_options --disable-strip
257#ac_add_options --disable-install-strip
258
259# Disabling debug symbols makes the build much smaller and a little
260# faster. Comment this if you need to run a debugger. Note: This is
261# required for compilation on i686.
262ac_add_options --disable-debug-symbols
263
264# The elf-hack is reported to cause failed installs (after successful builds)
265# on some machines. It is supposed to improve startup time and it shrinks
266# libxul.so by a few MB - comment this if you know your machine is not affected.
267ac_add_options --disable-elf-hack
268
269# The BLFS editors recommend not changing anything below this line:
270ac_add_options --prefix=/usr
271ac_add_options --enable-application=browser
272ac_add_options --disable-crashreporter
273ac_add_options --disable-updater
274# enabling the tests will use a lot more space and significantly
275# increase the build time, for no obvious benefit.
276ac_add_options --disable-tests
277
278# The default level of optimization again produces a working build with gcc.
279ac_add_options --enable-optimize
280
281ac_add_options --enable-system-ffi
282ac_add_options --enable-system-pixman
283
284# --with-system-bz2 was removed in firefox-78
285ac_add_options --with-system-jpeg
286ac_add_options --with-system-png
287ac_add_options --with-system-zlib
288
289# The following option unsets Telemetry Reporting. With the Addons Fiasco,
290# Mozilla was found to be collecting user's data, including saved passwords and
291# web form data, without users consent. Mozilla was also found shipping updates
292# to systems without the user's knowledge or permission.
293# As a result of this, use the following command to permanently disable
294# telemetry reporting in Firefox.
295unset MOZ_TELEMETRY_REPORTING
296
297mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/firefox-build-dir</literal>
298EOF</userinput></screen>
299
300 <para>
301 Compile <application>Firefox</application> by issuing the following
302 commands:
303 </para>
304
305 <para>
306 In the esr version of firefox-78, the code to ensure that add-ons
307 are signed by the trusted root has been disabled, presumably for
308 organizations which require their own add-ons. To enable it as an
309 added security measure issue the following command:
310 </para>
311
312<screen><userinput>
313sed -e 's/Disable/Enable/' \
314 -e '/^MOZ_REQUIRE_SIGNING/s/0/1/' \
315 -i build/mozconfig.common</userinput></screen>
316
317 <para>
318 If the geolocation APIs are needed:
319 </para>
320
321 <note>
322 <para>
323 <!-- Taken from Arch Linux - an immensely helpful link - Thanks -->
324 The Google and Mozilla API Keys below are specific to LFS. If using
325 these instructions for another distro, or if you intend to distribute
326 binary copies of the software using these instructions, please obtain
327 your own keys following the instructions located at
328 <ulink url="http://www.chromium.org/developers/how-tos/api-keys"/> and
329 <ulink url="https://location.services.mozilla.com/api"/> respectively.
330 <!-- BLFS Devs, register an account at Google with your
331 @linuxfromscratch.org email address, and I'll make you an administrator
332 for the 'Google APIs for LFS' project (where the API and OAuth keys
333 were created for use in the book).-->
334 </para>
335 </note>
336
337<screen><userinput>echo "AIzaSyDxKL42zsPjbke5O8_rPVpVrLrJ8aeE9rQ" > google-key
338echo "613364a7-9418-4c86-bcee-57e32fd70c23" > mozilla-key</userinput></screen>
339
340 <note>
341
342 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
343 href="../../xincludes/mozshm.xml"/>
344
345 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
346 href="../../xincludes/mozmach.xml"/>
347
348 </note>
349 <!--
350 <para>
351 If you are building on i686, apply a fix to prevent Internal Compiler
352 Errors in GCC-7+:
353 </para>
354
355<screen><userinput remap="pre">case $(uname -m) in
356 i?86) sed -i "562 s/mips64/i386/" gfx/skia/skia/third_party/skcms/src/Transform_inl.h ;;
357esac</userinput></screen>
358 -->
359<!--<para>
360 Apply a patch to allow this to be compiled with <xref linkend="rust"/>:
361 </para>
362
363<screen><userinput remap="pre">patch -p1 -i ../firefox-&firefox-version;esr-rustc1470-1.patch</userinput></screen>-->
364
365 <para>
366 Now invoke the Python script to compile the package.
367 </para>
368
369<screen><userinput>export CC=gcc CXX=g++ &amp;&amp;
370export MOZBUILD_STATE_PATH=${PWD}/mozbuild &amp;&amp;
371./mach configure &amp;&amp;
372./mach build</userinput></screen>
373
374 <para>
375 The <filename>mozconfig</filename> above disables the tests because
376 they use a lot more time and disk space for no obvious benefit. If
377 you have nevertheless enabled them, you can run the tests by executing
378 <command>./mach gtest</command>. This will require a network connection,
379 and to be run from within an Xorg session - there is a popup dialog
380 when it fails to connect to ALSA (that does not create a failed test).
381 One or two tests will fail. To see the details of the failure(s) you
382 will need to log the output from that command so that you can review it.
383 </para>
384
385 <para>
386 Now, as the <systemitem class="username">root</systemitem> user:
387 </para>
388
389<screen role="root"><userinput>./mach install &amp;&amp;
390
391mkdir -pv /usr/lib/mozilla/plugins &amp;&amp;
392ln -sfv ../../mozilla/plugins /usr/lib/firefox/browser/</userinput></screen>
393
394 <para>
395 Set environment variables back to their values:
396 </para>
397
398<screen><userinput>unset CC CXX MOZBUILD_STATE_PATH</userinput></screen>
399
400 </sect2>
401
402 <sect2 role="commands">
403 <title>Command Explanations</title>
404
405<!--<xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
406 href="../../xincludes/SIOCGSTAMP.xml"/>-->
407
408 <para>
409 <command>export CC=gcc CXX=g++ ...</command>: Upstream now prefer
410 <application>clang</application> so that they can use one compiler
411 everywhere. On the X86 architectures <application>clang</application>
412 now appears to support most of the same security-hardening options as
413 <application>GCC</application>.
414 <!-- supported in llvm-11
415 but the newer
416 <literal>-fstack-clash-protection</literal> is still not supported.-->
417 With the current versions and the default flags,
418 <application>GCC</application> creates a marginally bigger build but
419 takes typically 2 SBU less time on a 4-core machine using the mozconfig
420 above.
421 </para>
422
423 <para>
424 <command>export MOZBUILD_STATE_PATH=${PWD}/mozbuild</command>: The build
425 is now supposed to tell you that it intends to create <filename
426 class="directory">~/.mozbuild</filename>, and offer you an option to
427 press &lt;ENTER&gt; to accept this, or Ctrl-C to cancel and restart the
428 build after specifying the directory. In practice, the message may not
429 appear until after &lt;ENTER&gt; is keyed, i.e. the build stalls.
430 </para>
431
432 <para>
433 That directory is used for a (probably random) telemetry identifier.
434 Creating this in the build directory, and deleting that after the
435 installation, prevents it being used. If you wish to participate in
436 telemetry, export MOZBUILD_STATE_PATH to point to its default directory.
437 </para>
438
439 <para>
440 <command>./mach build</command>: <application>Firefox</application>
441 now uses this <application>python</application> script to run the
442 build and install.
443 </para>
444
445 <para>
446 <option>./mach build --verbose</option>: Use this alternative if you
447 need details of which files are being compiled, together with any C or
448 C++ flags being used. But do not add '--verbose' to the install command,
449 it is not accepted there.
450 </para>
451
452 <para>
453 <option>./mach build -jN</option>: The build should, by default, use
454 all the online CPU cores. If using all the cores causes the build to swap
455 because you have insufficient memory, using fewer cores can be faster.
456 </para>
457
458 <para>
459 <command>mkdir -pv /usr/lib/mozilla/plugins</command>: This ensures
460 that <filename class="directory">/usr/lib/mozilla/plugins/</filename>
461 exists.
462 </para>
463
464 <para>
465 <command>ln -sv ... /usr/lib/firefox/browser</command>:
466 This command creates a symbolic link to <filename
467 class="directory">/usr/lib/mozilla/plugins</filename>. It's not really
468 needed, as <application>Firefox</application> checks <filename
469 class="directory">/usr/lib/mozilla/plugins</filename> by default, but the
470 symbolic link is made to keep all the plugins installed in one folder.
471 </para>
472
473 </sect2>
474
475 <sect2 role="configuration">
476 <title>Configuring Firefox</title>
477
478 <para>
479 If you use a desktop environment like <application>Gnome</application> or
480 <application>KDE</application> you may like to create a
481 <filename>firefox.desktop</filename> file so that
482 <application>Firefox</application> appears in the panel's menus. <!--If you
483 didn't enable startup-notification in your mozconfig change the
484 StartupNotify line to false.--> As the
485 <systemitem class="username">root</systemitem> user:
486 </para>
487
488<screen role="root"><userinput>mkdir -pv /usr/share/applications &amp;&amp;
489mkdir -pv /usr/share/pixmaps &amp;&amp;
490
491cat &gt; /usr/share/applications/firefox.desktop &lt;&lt; "EOF" &amp;&amp;
492<literal>[Desktop Entry]
493Encoding=UTF-8
494Name=Firefox Web Browser
495Comment=Browse the World Wide Web
496GenericName=Web Browser
497Exec=firefox %u
498Terminal=false
499Type=Application
500Icon=firefox
501Categories=GNOME;GTK;Network;WebBrowser;
502MimeType=text/html;text/xml;application/xhtml+xml;application/vnd.mozilla.xul+xml;text/mml;x-scheme-handler/http;x-scheme-handler/https;
503StartupNotify=true</literal>
504EOF
505
506ln -sfv /usr/lib/firefox/browser/chrome/icons/default/default128.png \
507 /usr/share/pixmaps/firefox.png</userinput></screen>
508
509 <sect3><title>Configuration Information</title>
510
511 <para>
512 The application settings for firefox are accessible by keying
513 <command>about:config</command> in the address bar.
514 </para>
515
516 <para>
517 Occasionally, getting working sound in
518 <application>firefox</application> can be a problem. Although upstream
519 prefers pulseaudio,
520 on balance using <application>Alsa</application> may be easier.
521 </para>
522
523 <para>
524 If you enabled <application>Alsa</application> for sound, you may need
525 to alter one variable to get working sound. If you run
526 <command>firefox</command> from a term and try to play something with
527 sound you might encounter error messages like:
528 </para>
529
530 <para>
531 <literal>Sandbox: seccomp sandbox violation: pid 3941, tid 4030,
532 syscall 16, args 48 2147767296 139909894784796 0 0 0.</literal>
533 </para>
534
535 <para>
536 That was on x86_64, on i686 the syscall number is 54. To allow this
537 syscall, in <command>about:config</command> change
538 <command>security.sandbox.content.syscall_whitelist</command> to 16
539 (or 54 if using i686).
540 </para>
541
542 <para>
543 If you use <command>pulseaudio</command> in a Desktop Environment, it
544 might already be started by that DE. But if it is not, although
545 firefox-57 managed to start it, firefox-58 did not. If you run
546 <command>firefox</command> from a term and this problem is present,
547 trying to play sound will
548 encounter error messages warning <literal>Can't get cubeb
549 context!</literal>
550 </para>
551
552 <para>
553 The fix for this is to close firefox, start pulseaudio to check it
554 does start (if not, read the information on Configuring in <xref
555 linkend="pulseaudio"/>) and restart firefox to check it is working.
556 If it now works, add the following to your <filename>~/.xinitrc</filename>:
557<phrase revision="sysv">
558<literal>pulseaudio --verbose --log-target=syslog&amp;</literal></phrase>
559<phrase revision="systemd">
560<literal>pulseaudio --verbose --log-target=journald&amp;</literal></phrase>
561 (unfortunately, on some systems this does not work).
562 </para>
563
564 <para>
565 You may wish to use multiple profiles within firefox. To do that, invoke
566 firefox as <command>firefox --ProfileManager</command>. You can also
567 check which profile is currently in use from
568 <command>about:profiles</command>.
569 </para>
570
571 <para>
572 Although WebRender (using the GPU for compositing) is not used by
573 default, it now appears to work well on supported hardware (ATI, Nvidia
574 and Intel GPUs with Mesa-18 or later. For an explanation, please see
575 <ulink
576 url="https://hacks.mozilla.org/2017/10/the-whole-web-at-maximum-fps-how-webrender-gets-rid-of-jank/">hacks.mozilla.org</ulink>.
577 The only downside seems to be that on a machine with limited RAM it might
578 use more RAM.
579 </para>
580
581 <para>
582 To check if WebRender is being used, look in about:support. In the Graphics
583 section Compositing will either show 'Basic' (i.e. not in use) or
584 'WebRender'. To enable it, go to about:config and change gfx.webrender.all
585 to True. You will need to restart firefox.
586 </para>
587
588 <para>
589 It may be useful to mention the processes from firefox which can appear in
590 <command>top</command> - as well as firefox itself, there may be multiple
591 Web Content processes, and now an RDD Process (Remote Data Decoder) which
592 appears when playing web videos encoded with av1 (libdav1d). If WebRender
593 has been enabled, a GPU Process will also appear when firefox has to
594 repaint (e.g. scrolling, opening a new tab, or playing a video).
595 </para>
596
597 </sect3>
598 </sect2>
599
600 <sect2 role="content">
601 <title>Contents</title>
602
603 <segmentedlist>
604 <segtitle>Installed Programs</segtitle>
605 <segtitle>Installed Libraries</segtitle>
606 <segtitle>Installed Directory</segtitle>
607
608 <seglistitem>
609 <seg>
610 firefox
611 </seg>
612 <seg>
613 Numerous libraries, browser components, plugins, extensions, and
614 helper modules installed in /usr/lib/firefox
615 </seg>
616 <seg>
617 /usr/lib/firefox and /usr/lib/mozilla
618 </seg>
619 </seglistitem>
620 </segmentedlist>
621
622 <variablelist>
623 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
624 <?dbfo list-presentation="list"?>
625 <?dbhtml list-presentation="table"?>
626
627 <varlistentry id="firefox-prog">
628 <term><command>firefox</command></term>
629 <listitem>
630 <para>
631 is a <application>GTK+-3</application> internet browser that uses
632 the Mozilla Gecko rendering engine
633 </para>
634 <indexterm zone="firefox firefox-prog">
635 <primary sortas="b-firefox">firefox</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 </variablelist>
641
642 </sect2>
643
644</sect1>
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