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    1 GNU Emacs Installation Guide
    2 Copyright (C) 1992, 1994, 1996-1997, 2000-2017 Free Software Foundation,
    3 Inc.
    4 See the end of the file for license conditions.
    7 This file contains general information on building GNU Emacs.
    8 For more information specific to the MS-Windows, GNUstep/macOS, and
    9 MS-DOS ports, also read the files nt/INSTALL, nextstep/INSTALL, and
   10 msdos/INSTALL.  For information about building from a repository checkout
   11 (rather than a release), also read the file INSTALL.REPO.
   16 On most Unix systems, you build Emacs by first running the 'configure'
   17 shell script.  This attempts to deduce the correct values for
   18 various system-dependent variables and features, and find the
   19 directories where certain system headers and libraries are kept.
   20 In a few cases, you may need to explicitly tell configure where to
   21 find some things, or what options to use.
   23 'configure' creates a 'Makefile' in several subdirectories, and a
   24 'src/config.h' file containing system-dependent definitions.
   25 Running the 'make' utility then builds the package for your system.
   27 Building Emacs requires GNU make, <http://www.gnu.org/software/make/>.
   28 On most systems that Emacs supports, this is the default 'make' program.
   30 Here's the procedure to build Emacs using 'configure' on systems which
   31 are supported by it.  In some cases, if the simplified procedure fails,
   32 you might need to use various non-default options, and maybe perform
   33 some of the steps manually.  The more detailed description in the other
   34 sections of this guide will help you do that, so please refer to those
   35 sections if you need to.
   37   1. Unpacking the Emacs 25 release requires about 200 MB of free
   38   disk space.  Building Emacs uses about another 200 MB of space.
   39   The final installed Emacs uses about 150 MB of disk space.
   40   This includes the space-saving that comes from automatically
   41   compressing the Lisp source files on installation.
   43   2a. 'cd' to the directory where you unpacked Emacs and invoke the
   44       'configure' script:
   46 		 ./configure
   48   2b. Alternatively, create a separate directory, outside the source
   49       directory, where you want to build Emacs, and invoke 'configure'
   50       from there:
   52 		 SOURCE-DIR/configure
   54       where SOURCE-DIR is the top-level Emacs source directory.
   56   3. When 'configure' finishes, it prints several lines of details
   57      about the system configuration.  Read those details carefully
   58      looking for anything suspicious, such as wrong CPU and operating
   59      system names, wrong places for headers or libraries, missing
   60      libraries that you know are installed on your system, etc.
   62      If you find anything wrong, you may have to pass to 'configure'
   63      one or more options specifying the explicit machine configuration
   64      name, where to find various headers and libraries, etc.
   65      Refer to the section DETAILED BUILDING AND INSTALLATION below.
   67      If 'configure' didn't find some image support libraries, such as
   68      Xpm and jpeg, refer to "Image support libraries" below.
   70      If the details printed by 'configure' don't make any sense to
   71      you, but there are no obvious errors, assume that 'configure' did
   72      its job and proceed.
   74   4. Invoke the 'make' program:
   76 		 make
   78   5. If 'make' succeeds, it will build an executable program 'emacs'
   79      in the 'src' directory.  You can try this program, to make sure
   80      it works:
   82 		 src/emacs -Q
   84   6. Assuming that the program 'src/emacs' starts and displays its
   85      opening screen, you can install the program and its auxiliary
   86      files into their installation directories:
   88 		 make install
   90   You are now ready to use Emacs.  If you wish to conserve disk space,
   91   you may remove the program binaries and object files from the
   92   directory where you built Emacs:
   94 		 make clean
   96   You can delete the entire build directory if you do not plan to
   97   build Emacs again, but it can be useful to keep for debugging.
   98   If you want to build Emacs again with different configure options,
   99   first clean the source directories:
  101 		make distclean
  103   Note that the install automatically saves space by compressing
  104   (provided you have the 'gzip' program) those installed Lisp source (.el)
  105   files that have corresponding .elc versions, as well as the Info files.
  110 * Complex Text Layout support libraries
  112 On GNU and Unix systems, Emacs needs the optional libraries "m17n-db",
  113 "libm17n-flt", "libotf" to correctly display such complex scripts as
  114 Indic and Khmer, and also for scripts that require Arabic shaping
  115 support (Arabic and Farsi).  On some systems, particularly GNU/Linux,
  116 these libraries may be already present or available as additional
  117 packages.  Note that if there is a separate 'dev' or 'devel' package,
  118 for use at compilation time rather than run time, you will need that
  119 as well as the corresponding run time package; typically the dev
  120 package will contain header files and a library archive.  Otherwise,
  121 you can download the libraries from <http://www.nongnu.org/m17n/>.
  123 Note that Emacs cannot support complex scripts on a TTY, unless the
  124 terminal includes such a support.
  126 * intlfonts-VERSION.tar.gz
  128 The intlfonts distribution contains X11 fonts in various encodings
  129 that Emacs can use to display international characters.  If you see a
  130 non-ASCII character appear as a hollow box, that means you don't have
  131 a font for it.  You might find one in the intlfonts distribution.  If
  132 you do have a font for a non-ASCII character, but some characters
  133 don't look right, or appear improperly aligned, a font from the
  134 intlfonts distribution might look better.
  136 The fonts in the intlfonts distribution are also used by the ps-print
  137 package for printing international characters.  The file
  138 lisp/ps-mule.el defines the *.bdf font files required for printing
  139 each character set.
  141 The intlfonts distribution contains its own installation instructions,
  142 in the intlfonts/README file.
  144 * Image support libraries
  146 Emacs needs libraries to display images, with the exception of PBM and
  147 XBM images whose support is built-in.
  149 On some systems, particularly on GNU/Linux, these libraries may
  150 already be present or available as additional packages.  If
  151 there is a separate 'dev' or 'devel' package, for use at compilation
  152 time rather than run time, you will need that as well as the
  153 corresponding run time package; typically the dev package will
  154 contain header files and a library archive.  Otherwise, you can
  155 download and build libraries from sources.  Although none of them are
  156 essential for running Emacs, some are important enough that
  157 'configure' will report an error if they are absent from a system that
  158 has X11 support, unless 'configure' is specifically told to omit them.
  160 Here's a list of some of these libraries, and the URLs where they
  161 can be found (in the unlikely event that your distribution does not
  162 provide them).  By default, libraries marked with an X are required if
  163 X11 is being used.
  165     libXaw3d          http://directory.fsf.org/project/xaw3d/
  166   X libxpm for XPM:   http://www.x.org/releases/current/src/lib/
  167   X libpng for PNG:   http://www.libpng.org/
  168     libz (for PNG):   http://www.zlib.net/
  169   X libjpeg for JPEG: http://www.ijg.org/
  170   X libtiff for TIFF: http://www.remotesensing.org/libtiff/
  171   X libgif for GIF:   http://sourceforge.net/projects/giflib/
  172     librsvg2 for SVG: http://wiki.gnome.org/action/show/Projects/LibRsvg
  174 If you supply the appropriate --without-LIB option, 'configure' will
  175 omit the corresponding library from Emacs, even if that makes for a
  176 less-pleasant user interface.  Otherwise, Emacs will configure itself
  177 to build with these libraries if 'configure' finds them on your
  178 system, and 'configure' will complain and exit if a library marked 'X'
  179 is not found on a system that uses X11.  Use --without-LIB if your
  180 version of a library won't work because some routines are missing.
  182 * Extra fonts
  184 The Emacs distribution does not include fonts and does not install
  185 them.
  187 On the GNU system, Emacs supports both X fonts and local fonts
  188 (i.e. fonts managed by the fontconfig library).  If you need more
  189 fonts than your distribution normally provides, you must install them
  190 yourself.  See <URL:http://www.gnu.org/software/freefont/> for a large
  191 number of free Unicode fonts.
  193 * GNU/Linux development packages
  195 Many GNU/Linux systems do not come with development packages by default;
  196 they include the files that you need to run Emacs, but not those you
  197 need to compile it.  For example, to compile Emacs with support for X
  198 and graphics libraries, you may need to install the X development
  199 package(s), and development versions of the jpeg, png, etc. packages.
  201 The names of the packages that you need varies according to the
  202 GNU/Linux distribution that you use, and the options that you want to
  203 configure Emacs with.  On Debian-based systems, you can install all the
  204 packages needed to build the installed version of Emacs with a command
  205 like 'apt-get build-dep emacs24'.  On Red Hat systems, the
  206 corresponding command is 'yum-builddep emacs'.
  211 (This is for a Unix or Unix-like system.  For GNUstep and macOS,
  212 see nextstep/INSTALL.  For non-ancient versions of MS Windows, see
  213 the file nt/INSTALL.  For MS-DOS and MS Windows 3.X, see msdos/INSTALL.)
  215 1) See the basic installation summary above for the disk space requirements.
  217 2) In the unlikely event that 'configure' does not detect your system
  218 type correctly, consult './etc/MACHINES' to see what --host, --build
  219 options you should pass to 'configure'.  That file also offers hints
  220 for getting around some possible installation problems.
  222 3) You can build Emacs in the top-level Emacs source directory
  223 or in a separate directory.
  225 3a) To build in the top-level Emacs source directory, go to that
  226 directory and run the program 'configure' as follows:
  228     ./configure [--OPTION[=VALUE]] ...
  230 If 'configure' cannot determine your system type, try again
  231 specifying the proper --build, --host options explicitly.
  233 If you don't want X support, specify '--with-x=no'.  If you omit this
  234 option, 'configure' will try to figure out for itself whether your
  235 system has X, and arrange to use it if present.
  237 The '--x-includes=DIR' and '--x-libraries=DIR' options tell the build
  238 process where the compiler should look for the include files and
  239 object libraries used with the X Window System.  Normally, 'configure'
  240 is able to find them; these options are necessary if you have your X
  241 Window System files installed in unusual places.  These options also
  242 accept a list of directories, separated with colons.
  244 To get more attractive menus, you can specify an X toolkit when you
  245 configure Emacs; use the option '--with-x-toolkit=TOOLKIT', where
  246 TOOLKIT is 'gtk' (the default), 'athena', or 'motif' ('yes' and
  247 'lucid' are synonyms for 'athena').  Compiling with Motif causes a
  248 standard File Selection Dialog to pop up when you invoke file commands
  249 with the mouse.  You can get fancy 3D-style scroll bars, even without
  250 Gtk or Motif, if you have the Xaw3d library installed (see
  251 "Image support libraries" above for Xaw3d availability).
  253 You can tell configure where to search for GTK by giving it the
  254 argument PKG_CONFIG='/full/name/of/pkg-config'.
  256 Emacs will autolaunch a D-Bus session bus, when the environment
  257 variable DISPLAY is set, but no session bus is running.  This might be
  258 inconvenient for Emacs when running as daemon or running via a remote
  259 ssh connection.  In order to completely prevent the use of D-Bus, configure
  260 Emacs with the options '--without-dbus --without-gconf --without-gsettings'.
  262 The Emacs mail reader RMAIL is configured to be able to read mail from
  263 a POP3 server by default.  Versions of the POP protocol older than
  264 POP3 are not supported.  For Kerberos-authenticated POP add
  265 '--with-kerberos', for Hesiod support add '--with-hesiod'.  While POP3
  266 is always enabled, whether Emacs actually uses POP is controlled by
  267 individual users--see the Rmail chapter of the Emacs manual.
  269 For image support you may have to download, build, and install the
  270 appropriate image support libraries for image types other than XBM and
  271 PBM, see the list of URLs in "Image support libraries" above.
  272 (Note that PNG support requires libz in addition to libpng.)
  274 To disable individual types of image support in Emacs for some reason,
  275 even though configure finds the libraries, you can configure with one
  276 or more of these options:
  278   --without-xpm          for XPM image support
  279   --without-jpeg         for JPEG image support
  280   --without-tiff         for TIFF image support
  281   --without-gif          for GIF image support
  282   --without-png          for PNG image support
  283   --without-rsvg         for SVG image support
  284   --without-imagemagick  for Imagemagick support
  286 Use --without-toolkit-scroll-bars to disable Motif or Xaw3d scroll bars.
  288 Use --without-xim to inhibit the default use of X Input Methods.
  289 In this case, the X resource useXIM can be used to turn on use of XIM.
  291 Use --disable-largefile to omit support for files larger than 2GB on
  292 systems which support that.
  294 Use --without-sound to disable sound support.
  296 Use --without-all for a smaller executable with fewer dependencies on
  297 external libraries, at the cost of disabling many features.  Although
  298 --without-all disables libraries not needed for ordinary Emacs
  299 operation, it does enable X support, and using the GTK2 or GTK3
  300 toolkit creates a lot of library dependencies.  So if you want to
  301 build a small executable with very basic X support, use --without-all
  302 --with-x-toolkit=no.  For the smallest possible executable without X,
  303 use --without-all --without-x.  If you want to build with just a few
  304 features enabled, you can combine --without-all with --with-FEATURE.
  305 For example, you can use --without-all --without-x --with-dbus to
  306 build with DBus support and nothing more.
  308 Use --with-wide-int to implement Emacs values with the type 'long long',
  309 even on hosts where a narrower type would do.  With this option, on a
  310 typical 32-bit host, Emacs integers have 62 bits instead of 30.
  312 Use --with-cairo to compile Emacs with Cairo drawing.
  314 Use --with-modules to build Emacs with support for loading dynamic
  315 modules.
  317 Use --enable-gcc-warnings to enable compile-time checks that warn
  318 about possibly-questionable C code.  This is intended for developers
  319 and is useful with GNU-compatible compilers.  On a recent GNU system
  320 there should be no warnings; on older and on non-GNU systems the
  321 generated warnings may still be useful, though you may prefer building
  322 with 'make WERROR_CFLAGS=' so that the warnings are not treated as
  323 errors.
  325 Use --disable-silent-rules to cause 'make' to give more details about
  326 the commands it executes.  This can be helpful when debugging a build
  327 that goes awry.  'make V=1' also enables the extra chatter.
  329 Use --enable-link-time-optimization to enable link-time optimizer.  If
  330 you're using GNU compiler, this feature is supported since version 4.5.0.
  331 If 'configure' can determine number of online CPUS on your system, final
  332 link-time optimization and code generation is executed in parallel using
  333 one job per each available online CPU.
  335 This option is also supported for clang.  You should have GNU binutils
  336 with 'gold' linker and plugin support, and clang with LLVMgold.so plugin.
  337 Read http://llvm.org/docs/GoldPlugin.html for details.  Also note that
  338 this feature is still experimental, so prepare to build binutils and
  339 clang from the corresponding source code repositories.
  341 The '--prefix=PREFIXDIR' option specifies where the installation process
  342 should put emacs and its data files.  This defaults to '/usr/local'.
  343 - Emacs (and the other utilities users run) go in PREFIXDIR/bin
  344   (unless the '--exec-prefix' option says otherwise).
  345 - The architecture-independent files go in PREFIXDIR/share/emacs/VERSION
  346   (where VERSION is the version number of Emacs, like '23.2').
  347 - The architecture-dependent files go in
  349   (where CONFIGURATION is the configuration name, like
  350   i686-pc-linux-gnu), unless the '--exec-prefix' option says otherwise.
  352 The '--exec-prefix=EXECDIR' option allows you to specify a separate
  353 portion of the directory tree for installing architecture-specific
  354 files, like executables and utility programs.  If specified,
  355 - Emacs (and the other utilities users run) go in EXECDIR/bin, and
  356 - The architecture-dependent files go in
  358 EXECDIR/bin should be a directory that is normally in users' PATHs.
  360 For example, the command
  362     ./configure --build=i386-linux-gnu --without-sound
  364 configures Emacs to build for a 32-bit GNU/Linux distribution,
  365 without sound support.
  367 'configure' doesn't do any compilation or installation itself.
  368 It just creates the files that influence those things:
  369 './Makefile' in the top-level directory and several subdirectories;
  370 and './src/config.h'.
  372 When it is done, 'configure' prints a description of what it did and
  373 creates a shell script 'config.status' which, when run, recreates the
  374 same configuration.  If 'configure' exits with an error after
  375 disturbing the status quo, it removes 'config.status'.  'configure'
  376 also creates a file 'config.cache' that saves the results of its tests
  377 to make reconfiguring faster, and a file 'config.log' containing compiler
  378 output (useful mainly for debugging 'configure').  You can give
  379 'configure' the option '--cache-file=FILE' to use the results of the
  380 tests in FILE instead of 'config.cache'.  Set FILE to '/dev/null' to
  381 disable caching, for debugging 'configure'.
  383 If the description of the system configuration printed by 'configure'
  384 is not right, or if it claims some of the features or libraries are not
  385 available when you know they are, look at the 'config.log' file for
  386 the trace of the failed tests performed by 'configure' to check
  387 whether these features are supported.  Typically, some test fails
  388 because the compiler cannot find some function in the system
  389 libraries, or some macro-processor definition in the system headers.
  391 Some tests might fail because the compiler should look in special
  392 directories for some header files, or link against optional
  393 libraries, or use special compilation options.  You can force
  394 'configure' and the build process which follows it to do that by
  395 setting the variables CPPFLAGS, CFLAGS, LDFLAGS, LIBS, CPP and CC
  396 before running 'configure'.  CPP is the command which invokes the
  397 preprocessor, CPPFLAGS lists the options passed to it, CFLAGS are
  398 compilation options, LDFLAGS are options used when linking, LIBS are
  399 libraries to link against, and CC is the command which invokes the
  400 compiler.  By default, gcc is used if available.
  402 Here's an example of a 'configure' invocation, assuming a Bourne-like
  403 shell such as Bash, which uses these variables:
  405   ./configure \
  406     CPPFLAGS='-I/foo/myinclude' LDFLAGS='-L/bar/mylib' \
  407     CFLAGS='-O3' LIBS='-lfoo -lbar'
  409 (this is all one shell command).  This tells 'configure' to instruct the
  410 preprocessor to look in the '/foo/myinclude' directory for header
  411 files (in addition to the standard directories), instruct the linker
  412 to look in '/bar/mylib' for libraries, pass the -O3 optimization
  413 switch to the compiler, and link against libfoo and libbar
  414 libraries in addition to the standard ones.
  416 For some libraries, like Gtk+, fontconfig and ALSA, 'configure' uses
  417 pkg-config to find where those libraries are installed.
  418 If you want pkg-config to look in special directories, you have to set
  419 PKG_CONFIG_PATH to point to the directories where the .pc-files for
  420 those libraries are.  For example:
  422   ./configure \
  423     PKG_CONFIG_PATH='/usr/local/alsa/lib/pkgconfig:/opt/gtk+-2.8/lib/pkgconfig'
  425 3b) To build in a separate directory, go to that directory
  426 and run the program 'configure' as follows:
  430 SOURCE-DIR refers to the top-level Emacs source directory which is
  431 where Emacs's configure script is located.  'configure' looks for the
  432 Emacs source code in the directory that 'configure' is in.
  434 4) Put into './lisp/site-init.el' or './lisp/site-load.el' any Emacs
  435 Lisp code you want Emacs to load before it is dumped out.  Use
  436 site-load.el for additional libraries if you arrange for their
  437 documentation strings to be in the etc/DOC file (see
  438 src/Makefile.in if you wish to figure out how to do that).  For all
  439 else, use site-init.el.  Do not load byte-compiled code which
  440 was built with a non-nil value of 'byte-compile-dynamic'.
  442 It is not a good idea to edit the normal .el files that come with Emacs.
  443 Instead, use a file like site-init.el to change settings.
  445 To change the value of a variable that is already defined in Emacs,
  446 you should use the Lisp function 'setq', not 'defvar'.  For example,
  448      (setq news-inews-program "/usr/bin/inews")
  450 is how you would override the default value of the variable
  451 news-inews-program.
  453 Before you override a variable this way, *look at the value* that the
  454 variable gets by default!  Make sure you know what kind of value the
  455 variable should have.  If you don't pay attention to what you are
  456 doing, you'll make a mistake.
  458 The 'site-*.el' files are nonexistent in the distribution.  You do not
  459 need to create them if you have nothing to put in them.
  461 5) Refer to the file './etc/TERMS' for information on fields you may
  462 wish to add to various termcap entries.  (This is unlikely to be necessary.)
  464 6) Run 'make' in the top directory of the Emacs distribution to finish
  465 building Emacs in the standard way.  The final executable file is
  466 named 'src/emacs'.  You can execute this file "in place" without
  467 copying it, if you wish; then it automatically uses the sibling
  468 directories ../lisp, ../lib-src, ../info.
  470 Or you can "install" the executable and the other files into their
  471 installed locations, with 'make install'.  By default, Emacs's files
  472 are installed in the following directories:
  474 '/usr/local/bin' holds the executable programs users normally run -
  475 		'emacs', 'etags', 'ctags', 'emacsclient'.
  477 '/usr/local/share/emacs/VERSION/lisp' holds the Emacs Lisp library;
  478 		'VERSION' stands for the number of the Emacs version
  479 		you are installing, like '23.1' or '23.2'.  Since the
  480 		Lisp library changes from one version of Emacs to
  481 		another, including the version number in the path
  482 		allows you to have several versions of Emacs installed
  483 		at the same time; in particular, you don't have to
  484 		make Emacs unavailable while installing a new version.
  486 '/usr/local/share/emacs/VERSION/etc' holds the Emacs tutorial, the DOC
  487 		file, and other architecture-independent files Emacs
  488 		might need while running.
  490 '/usr/local/libexec/emacs/VERSION/CONFIGURATION-NAME' contains executable
  491 		programs used by Emacs that users are not expected to
  492 		run themselves.
  493 		'VERSION' is the number of the Emacs version you are
  494 		installing, and 'CONFIGURATION-NAME' is the value
  495 		deduced by the 'configure' program to identify the
  496 		architecture and operating system of your machine,
  497 		like 'i686-pc-linux-gnu' or 'sparc-sun-sunos'.  Since
  498 		these files are specific to the version of Emacs,
  499 		operating system, and architecture in use, including
  500 		the configuration name in the path allows you to have
  501 		several versions of Emacs for any mix of machines and
  502 		operating systems installed at the same time; this is
  503 		useful for sites at which different kinds of machines
  504 		share the file system Emacs is installed on.
  506 '/usr/local/share/info' holds the on-line documentation for Emacs,
  507 		known as "info files".  Many other GNU programs are
  508 		documented using info files as well, so this directory
  509 		stands apart from the other, Emacs-specific directories.
  511 '/usr/local/share/man/man1' holds the man pages for the programs installed
  512 		in '/usr/local/bin'.
  514 Any version of Emacs, whether installed or not, also looks for Lisp
  515 files in these directories.
  517 '/usr/local/share/emacs/VERSION/site-lisp' holds the local Emacs Lisp
  518 		files installed for Emacs version VERSION only.
  520 '/usr/local/share/emacs/site-lisp' holds the local Emacs Lisp
  521 		files installed for all Emacs versions.
  523 		When Emacs is installed, it searches for its Lisp files
  524 		in '/usr/local/share/emacs/VERSION/site-lisp', then in
  525 		'/usr/local/share/emacs/site-lisp', and finally in
  526 		'/usr/local/share/emacs/VERSION/lisp'.
  528 If these directories are not what you want, you can specify where to
  529 install Emacs's libraries and data files or where Emacs should search
  530 for its Lisp files by giving values for 'make' variables as part of
  531 the command.  See the section below called 'MAKE VARIABLES' for more
  532 information on this.
  534 7) Check the file 'dir' in your site's info directory (usually
  535 /usr/local/share/info) to make sure that it has a menu entry for the
  536 Emacs info files.
  538 8) If your system uses lock files to interlock access to mailer inbox files,
  539 then you might need to make the movemail program setuid or setgid
  540 to enable it to write the lock files.  We believe this is safe.
  542 9) You are done!  You can remove executables and object files from
  543 the build directory by typing 'make clean'.  To also remove the files
  544 that 'configure' created (so you can compile Emacs for a different
  545 configuration), type 'make distclean'.
  550 You can change where the build process installs Emacs and its data
  551 files by specifying values for 'make' variables as part of the 'make'
  552 command line.  For example, if you type
  554     make install bindir=/usr/local/gnubin
  556 the 'bindir=/usr/local/gnubin' argument indicates that the Emacs
  557 executable files should go in '/usr/local/gnubin', not
  558 '/usr/local/bin'.
  560 Here is a complete list of the variables you may want to set.
  562 'bindir' indicates where to put executable programs that users can
  563 	run.  This defaults to /usr/local/bin.
  565 'datadir' indicates where to put the architecture-independent
  566 	read-only data files that Emacs refers to while it runs; it
  567 	defaults to /usr/local/share.  We create the following
  568 	subdirectories under 'datadir':
  569 	- 'emacs/VERSION/lisp', containing the Emacs Lisp library, and
  570 	- 'emacs/VERSION/etc', containing the tutorials, DOC file, etc.
  571 	'VERSION' is the number of the Emacs version you are installing,
  572 	like '23.1' or '23.2'.  Since these files vary from one version
  573 	of Emacs to another, including the version number in the path
  574 	allows you to have several versions of Emacs installed at the
  575 	same time; this means that you don't have to make Emacs
  576 	unavailable while installing a new version.
  578 'libexecdir' indicates where to put architecture-specific data files that
  579 	Emacs refers to as it runs; it defaults to '/usr/local/libexec'.
  580 	We create the following subdirectories under 'libexecdir':
  581 	- 'emacs/VERSION/CONFIGURATION-NAME', containing executable
  582 		programs used by Emacs that users are not expected to run
  583 		themselves.
  584 	'VERSION' is the number of the Emacs version you are installing,
  585 	and 'CONFIGURATION-NAME' is the value deduced by the
  586 	'configure' program to identify the architecture and operating
  587 	system of your machine, like 'i686-pc-linux-gnu' or 'sparc-sun-sunos'.
  588 	Since these files are specific to the version of Emacs,
  589 	operating system, and architecture in use, including the
  590 	configuration name in the path allows you to have several
  591 	versions of Emacs for any mix of machines and operating
  592 	systems installed at the same time; this is useful for sites
  593 	at which different kinds of machines share the file system
  594 	Emacs is installed on.
  596 'infodir' indicates where to put the info files distributed with
  597 	Emacs; it defaults to '/usr/local/share/info'.
  599 'mandir' indicates where to put the man pages for Emacs and its
  600 	utilities (like 'etags'); it defaults to
  601 	'/usr/local/share/man/man1'.
  603 'prefix' doesn't give a path for any specific part of Emacs; instead,
  604 	its value is used to determine the defaults for all the
  605 	architecture-independent path variables - 'datadir',
  606 	'sharedstatedir', 'infodir', and 'mandir'.  Its default value is
  607 	'/usr/local'; the other variables add on 'lib' or 'man' to it
  608 	by default.
  610 	For example, suppose your site generally places GNU software
  611 	under '/usr/users/software/gnusoft' instead of '/usr/local'.
  612 	By including
  613 	    'prefix=/usr/users/software/gnusoft'
  614 	in the arguments to 'make', you can instruct the build process
  615 	to place all of the Emacs data files in the appropriate
  616 	directories under that path.
  618 'exec_prefix' serves the same purpose as 'prefix', but instead
  619 	determines the default values for the architecture-dependent
  620 	path variables - 'bindir' and 'libexecdir'.
  622 The above variables serve analogous purposes in the makefiles for all
  623 GNU software; the following variables are specific to Emacs.
  625 'archlibdir' indicates where Emacs installs and expects the executable
  626 	files and other architecture-dependent data it uses while
  627 	running.  Its default value, based on 'libexecdir' (which
  628 	see), is '/usr/local/libexec/emacs/VERSION/CONFIGURATION-NAME'
  629 	(where VERSION and CONFIGURATION-NAME are as described above).
  631 'GZIP_PROG' is the name of the executable that compresses installed info,
  632 	manual, and .el files.  It defaults to gzip.  Setting it to
  633 	the empty string suppresses compression.
  635 Remember that you must specify any variable values you need each time
  636 you run 'make' in the top directory.  If you run 'make' once to build
  637 emacs, test it, and then run 'make' again to install the files, you
  638 must provide the same variable settings each time.  To make the
  639 settings persist, you can edit them into the 'Makefile' in the top
  640 directory, but be aware that running the 'configure' program erases
  641 'Makefile' and rebuilds it from 'Makefile.in'.
  643 The path for finding Lisp files is specified in src/epaths.h,
  644 a file which is generated by running configure.  To change the path,
  645 you can edit the definition of PATH_LOADSEARCH in that file
  646 before you run 'make'.
  648 The top-level Makefile stores the variable settings it used in the
  649 Makefiles for the subdirectories, so you don't have to specify them
  650 when running make in the subdirectories.
  655 See the file './etc/PROBLEMS' for a list of various problems sometimes
  656 encountered, and what to do about them.
  658 This file is part of GNU Emacs.
  660 GNU Emacs is free software: you can redistribute it and/or modify
  661 it under the terms of the GNU General Public License as published by
  662 the Free Software Foundation, either version 3 of the License, or
  663 (at your option) any later version.
  665 GNU Emacs is distributed in the hope that it will be useful,
  666 but WITHOUT ANY WARRANTY; without even the implied warranty of
  668 GNU General Public License for more details.
  670 You should have received a copy of the GNU General Public License
  671 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.