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emacs/nt/INSTALL
Eli Zaretskii d875a22bc6 Update the various INSTALL files 
* nt/INSTALL.W64:
* nt/INSTALL:
* INSTALL: Update the installation information, in particular the
fact that HarfBuzz is now preferred as the shaping library.
2020-11-14 15:55:35 +02:00

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Building and Installing Emacs on MS-Windows
using the MSYS and MinGW tools
Copyright (C) 2013-2020 Free Software Foundation, Inc.
See the end of the file for license conditions.
The MSYS/MinGW build described here is supported on versions of
Windows starting with Windows XP and newer. Building on Windows 2000
and Windows 9X is not supported (but the Emacs binary produced by this
build will run on Windows 9X and newer systems).
Do not use this recipe with Cygwin. For building on Cygwin, use the
normal installation instructions, ../INSTALL.
For building Emacs using the MinGW64/MSYS2 toolchain, see the
instructions in the file INSTALL.W64 in this directory.
* For the brave (a.k.a. "impatient"):
For those who have a working MSYS/MinGW development environment and
are comfortable with running Posix configure scripts, here are the
concise instructions for configuring and building the native Windows
binary of Emacs with these tools:
0. Start the MSYS Bash window. Everything else below is done from
that window's Bash prompt.
0a. If you are building from the development trunk (as opposed to a
release tarball), produce the configure script, by typing from
the top-level Emacs source directory:
./autogen.sh
1. If you want to build Emacs outside of the source tree
(recommended), create the build directory and chdir there.
2. Invoke the configure script:
- If you are building outside the source tree:
/PATH/TO/EMACS/SOURCE/TREE/configure --prefix=PREFIX ...
- If you are building in-place, i.e. inside the source tree:
./configure --prefix=PREFIX ...
It is always preferable to use --prefix to configure Emacs for
some specific location of its installed tree; the default
/usr/local is not suitable for Windows (see the detailed
instructions for the reasons). The prefix must be absolute.
You can pass other options to the configure script. Here's a
typical example (for an in-place debug build):
./configure --prefix=/d/usr/emacs --enable-checking='yes,glyphs' \
CFLAGS='-O0 -g3'
3. After the configure script finishes, it should display the
resulting configuration. After that, type
make
Use "make -j N" if your MSYS Make supports parallel execution;
the build will take significantly less time in that case. Here N
is the number of simultaneous parallel jobs; use the number of
the cores on your system.
4. Install the produced binaries:
make install
If you want the installation tree to go to a place that is
different from the one specified by --prefix, say
make install prefix=/where/ever/you/want
That's it!
If these short instructions somehow fail, read the rest of this
file.
* Installing Git for Windows
Skip this section if you already have Git installed and configured,
or if you are building from the release tarball, not from the
development repository.
Git for Windows is available from this download page:
https://github.com/git-for-windows/git/releases
That page offers both 32-bit and 64-bit installations; pick the one
suitable for your OS. In general, we recommend to install a 64-bit
Git if you have a 64-bit Windows system; the 32-bit Git will run on
64-bit Windows just fine, but might run into memory problems where
the 64-bit Git won't.
During Git installation, be sure to select the "Checkout as-is,
commit as-is" option from the "Configure line ending conversions"
dialog. Otherwise, Git will convert text files to DOS-style CRLF
end-of-line (EOL) format, which will cause subtle problems when
building Emacs, because MSYS tools (see below) used to build Emacs
use binary file I/O that preserves the CR characters that get in the
way of some text-processing tools, like 'makeinfo' and the commands
invoked by the autogen.sh script.
If you already have Git installed and configured with some other EOL
conversion option, you will need to reconfigure it, removing the
following variables from all of your .gitconfig files:
core.eol
core.safecrlf
core.autocrlf
If you cloned the Emacs directory before changing these config
variables, you will have to delete the repository and re-clone it
after the change.
The instructions for cloning the Emacs repository can be found on
the Emacs's Savannah project page:
https://savannah.gnu.org/projects/emacs
* Installing MinGW and MSYS
Make sure you carefully read the following two sections in their
entirety and install/configure the various packages as instructed.
A correct installation makes all the rest almost trivial; a botched
installation will likely make you miserable for quite some time.
There are two alternatives to installing MinGW + MSYS: using the GUI
installer, called mingw-get, provided by the MinGW project, or
manual installation. The next two sections describe each one of
these.
** Installing MinGW and MSYS using mingw-get
A nice installer, called mingw-get, is available for those who don't
like to mess with manual installations. You can download it from
here:
https://sourceforge.net/projects/mingw/files/Installer/mingw-get/
(This installer only supports packages downloaded from the MinGW
site; for the rest you will still need the manual method.)
After installing mingw-get, invoke it to install the packages that
are already selected by default on the "Select Components" screen of
its wizard.
After that, use "mingw-get install PACKAGE" to install the following
additional packages:
. msys-base
. mingw-developer-toolkit
When the installation ends, perform the post-installation steps
described on this page of the MinGW site:
http://www.mingw.org/wiki/Getting_Started
in the "After Installing You Should ..." section. These steps are
important for making your installation complete, and in particular
will produce a desktop shortcut for running the MSYS Bash shell,
from which you will configure and build Emacs. Once you've made the
shortcut, double-click on it to open the MSYS Bash shell window,
where you will proceed with the rest of these instructions.
In addition, we suggest to modify your system-wide Path variable to
include the 'bin' subdirectory of your top-level MinGW installation
directory, the one you specified to mingw-get ("C:\MinGW" by
default). This will allow you to invoke the MinGW development
tools, like GCC, from the Windows cmd.exe shell windows or from
other Windows programs (including Emacs, after you build and install
it).
(We recommend that you refrain from installing the MSYS Texinfo
package, which is part of msys-base, because it might produce mixed
EOL format when installing Info files. Instead, install the MinGW
port of Texinfo, see the ezwinports URL below. To uninstall the
MSYS Texinfo, after installing it as part of msys-base, invoke the
command "mingw-get remove msys-texinfo", or mark "msys-texinfo" for
removal in the mingw-get GUI, then select Installation->Apply Changes.)
(Similarly, we recommend to refrain from installing the MinGW
Autoconf package; instead, install its MSYS build available from the
ezwinports site, see below.)
At this point, you should be ready to configure and build Emacs in
its basic configuration. Skip to the "Generating the configure
script" section for the build instructions. If you want to build it
with image support and other optional libraries, read about the
optional libraries near the end of this document, before you start
the build. Also, consider installing additional MinGW packages that
are required/recommended, especially if you are building from the
development repository, as described in the next section.
** Installing MinGW and MSYS manually
*** MinGW
You will need to install the MinGW port of GCC and Binutils, and the
MinGW runtime and Windows API distributions, to compile Emacs. You
can find these on the MinGW download/Base page:
https://sourceforge.net/projects/mingw/files/MinGW/Base/
In general, install the latest stable versions of the following
MinGW packages from that page: gcc, binutils, mingw-rt, w32api. You
only need the 'bin' and the 'dll' tarballs of each of the above.
MinGW packages are distributed as .tar.lzma compressed archives. To
install the packages manually, we recommend to use the Windows port
of the 'bsdtar' program to unpack the tarballs. 'bsdtar' is
available as part of the 'libarchive' package from here:
http://sourceforge.net/projects/ezwinports/files/
The recommended place to install these packages is a single tree
starting from some directory on a drive other than the system drive
C:. A typical example would be D:\usr, with D:\usr\bin holding the
binaries and DLLs (should be added to your Path environment
variable), D:\usr\include holding the include files, D:\usr\lib
holding the static and import libraries, D:\usr\share holding docs,
message catalogs, and package-specific subdirectories, etc.
Having all the headers and libraries in a single place will greatly
reduce the number of -I and -L flags you will have to pass to the
configure script (see below), as these files will be right where the
compiler expects them.
We specifically do NOT recommend installing packages below
"C:\Program Files" or "C:\Program Files (x86)". These directories
are protected on versions of Windows from Vista and on, and you will
have difficulties updating and maintaining your installation later,
due to UAC elevation prompts, file virtualization, etc. You *have*
been warned!
Additional MinGW packages are required/recommended, especially if
you are building from the development repository:
. Texinfo (needed to produce the Info manuals when building from
the repository, and for "make install")
Available from http://sourceforge.net/projects/ezwinports/files/.
. pkg-config (invoked by the configure script to look for optional
packages)
Available from http://sourceforge.net/projects/ezwinports/files/.
. gzip (needed to compress files during "make install")
Available from http://gnuwin32.sourceforge.net/packages/gzip.htm.
Each package might list other packages as prerequisites on its
download page (under "Runtime requirements"); download those as
well. (Using the mingw-get installer will fetch those prerequisites
automatically for you.) A missing prerequisite will manifest itself
by the program failing to run and presenting a pop-up dialog that
states the missing or incompatible DLL; be sure to find and install
these missing DLLs.
Once you think you have MinGW installed, test the installation by
building a trivial "hello, world!" program, and make sure that it
builds without any error messages and the binary works when run.
*** MSYS
You will need a reasonably full MSYS installation. MSYS is an
environment needed to run the Posix configure scripts and the
resulting Makefile's, in order to produce native Windows binaries
using the MinGW compiler and runtime libraries. Here's the list of
MSYS packages that are required:
. All the packages from the MSYS Base distribution, listed here:
https://sourceforge.net/projects/mingw/files/MSYS/Base/
. Additional packages listed below, from the MSYS Extension
distribution here:
https://sourceforge.net/projects/mingw/files/MSYS/Extension/
- flex
- bison
- m4
- perl
- mktemp
These should only be needed if you intend to build development
versions of Emacs from the repository.
. Additional package (needed only if building from the repository):
Autoconf. It is available from here:
http://sourceforge.net/projects/ezwinports/files/autoconf-2.65-msys-bin.zip/download
MSYS packages are distributed as .tar.lzma compressed archives. To
install the packages manually, we recommend to use the Windows port
of the 'bsdtar' program, already mentioned above.
MSYS packages should be installed in a separate tree from MinGW.
For example, use D:\MSYS or D:\usr\MSYS as the top-level directory
from which you unpack all of the MSYS packages.
After installing Autoconf, make sure any of the *.m4 files you might
have in your MinGW installation also exist in the MSYS installation
tree, in the share/aclocal directory. Those *.m4 files which exist
in the MinGW tree, but not in the MSYS tree should be copied there.
If/when you are confident in your MinGW/MSYS installation, and want
to speed up the builds, we recommend installing a pre-release
version of Make from here:
https://sourceforge.net/projects/mingwbuilds/files/external-binary-packages/
These are snapshot builds of many packages, but you only need
make.exe from there. The advantage of this make.exe is that it
supports parallel builds, so you can use "make -j N" to considerably
speed up your builds.
Several users reported that MSYS 1.0.18 causes Make to hang in
parallel builds. If you bump into this, we suggest to downgrade to
MSYS 1.0.17, which doesn't have that problem.
For each of these packages, install the 'bin' and 'dll' tarballs of
their latest stable releases. If there's an 'ext' tarball (e.g.,
msysCORE and Coreutils have it), download and install those as well.
Each package might list other packages as prerequisites on its
download page (under "Runtime requirements"); download those as
well. (Using the mingw-get installer will fetch those prerequisites
automatically for you.) A missing prerequisite will manifest itself
by the program failing to run and presenting a pop-up dialog that
states the missing or incompatible DLL; be sure to find and install
these missing DLLs.
Do NOT add the MSYS bin directory to your Windows Path! Only the
MinGW bin directory should be on Path. When you install MSYS, it
creates a shortcut on your desktop that invokes the MSYS Bash shell
in a Command Prompt window; that shell is already set up so that the
MSYS bin directory is on PATH ahead of any other directory. Thus,
Bash will find MSYS executables first, which is exactly what you
need.
* Starting the MSYS Bash shell
For most reliable and predictable results, we recommend to start
Bash by clicking the "MSYS" icon on your desktop. That icon is
created when you install MSYS, and using it is the official way of
running the MSYS tools.
For other methods of starting the shell, make sure Bash is invoked
with the "--login" command-line switch.
When the shell window opens and you get the shell prompt, change to
the directory where you intend to build Emacs.
At this point, you are ready to build Emacs in its basic
configuration. If you want to build it with image support and other
optional libraries, read about that near the end of this document.
* Generating the configure script
If you are building a release or pretest tarball, skip this section,
because the configure script is already present in the tarball.
To build a development snapshot from the Emacs repository,
you will first need to generate the configure script and a few other
auto-generated files.
To generate the configure script, type this at the MSYS Bash prompt
from the top-level directory of the Emacs source tree:
./autogen.sh
If successful, this command should produce the following output:
$ ./autogen.sh
Checking whether you have the necessary tools...
(Read INSTALL.REPO for more details on building Emacs)
Checking for autoconf (need at least version 2.65) ... ok
Your system has the required tools.
Building aclocal.m4 ...
Running 'autoreconf -fi -I m4' ...
You can now run './configure'.
If the script fails because it cannot find Git, you will need to
arrange for the MSYS Bash's PATH to include the Git's 'bin'
subdirectory, where there's the git.exe executable.
* Configuring Emacs for MinGW:
Now it's time to run the configure script. You can do that either
from a separate build directory that is outside of the Emacs source
tree (recommended), or from inside the source tree. The former is
recommended because it allows you to have several different builds,
e.g., an optimized build and an unoptimized one, of the same
revision of the source tree; the source tree will be left in its
pristine state, without any build products.
You invoke the configure script like this:
/PATH/TO/EMACS/SOURCE/TREE/configure --prefix=PREFIX ...
or, if you are building in-place, i.e. inside the source tree:
./configure --prefix=PREFIX ...
Here PREFIX is the place where you eventually want to install Emacs
once built, e.g. /d/usr. We recommend to always use --prefix when
building Emacs on Windows, because the default '/usr/local' is not
appropriate for Windows: it will be mapped by MSYS to something like
C:\MSYS\local, and it will defeat the purpose of PREFIX, which is to
install programs in a single coherent tree resembling Posix systems.
Such a single-tree installation makes sure all the other programs
and packages ported from GNU or Unix systems will work seamlessly
together. Where exactly is the root of that tree on your system is
something only you, the user who builds Emacs, can know, and the
Emacs build process cannot guess, because usually there's no
'/usr/local' directory on any drive on Windows systems.
Do NOT use Windows-style x:/foo/bar file names on the configure
script command line; use the MSYS-style /x/foo/bar instead. Using
Windows-style file names was reported to cause subtle and hard to
figure out problems during the build. This applies both to the
command switches, such as --prefix=, and to the absolute file name
of 'configure', if you are building outside of the source tree.
You can pass additional options to the configure script, for the
full list type
./configure --help
As explained in the help text, you may need to tell the script what
are the optional flags to invoke the compiler. This is needed if
some of your headers and libraries, e.g., those belonging to
optional image libraries, are installed in places where the compiler
normally doesn't look for them. (Remember that advice above to
avoid such situations? here's is where you will start paying for
disregarding that recommendation.) For example, if you have libpng
headers in C:\emacs\libs\libpng-1.2.37-lib\include and jpeg library
headers in C:\emacs\libs\jpeg-6b-4-lib\include, you will need to say
something like this:
CPPFLAGS='-I/c/emacs/libs/libpng-1.2.37-lib/include -I/c/emacs/libs/jpeg-6b-4-lib/include' ./configure --prefix=PREFIX
which is quite a mouth-full, especially if you have more directories
to specify... Perhaps you may wish to revisit your installation
decisions now.
If you have a global site-lisp directory from previous Emacs
installation, and you want Emacs to continue using it, specify it
via the --enable-locallisppath switch to 'configure', like this:
./configure --prefix=PREFIX --enable-locallisppath="/d/usr/share/emacs/VERSION/site-lisp:/d/wherever/site-lisp"
Use the normal MSYS /d/foo/bar style to specify directories by their
absolute file names.
A few frequently used options are needed when you want to produce an
unoptimized binary with runtime checks enabled:
./configure --prefix=PREFIX --enable-checking='yes,glyphs' \
CFLAGS='-O0 -g3'
Once invoked, the configure script will run for some time, and, if
successful, will eventually produce a summary of the configuration
similar to this:
Configured for 'i686-pc-mingw32'.
Where should the build process find the source code? /path/to/emacs/sources
What compiler should emacs be built with? gcc -std=gnu99 -O0 -g3
Should Emacs use the GNU version of malloc? no
(The GNU allocators don't work with this system configuration.)
Should Emacs use a relocating allocator for buffers? no
Should Emacs use mmap(2) for buffer allocation? yes
What window system should Emacs use? w32
What toolkit should Emacs use? none
Where do we find X Windows header files? NONE
Where do we find X Windows libraries? NONE
Does Emacs use -lXaw3d? no
Does Emacs use -lXpm? yes
Does Emacs use -ljpeg? yes
Does Emacs use -ltiff? yes
Does Emacs use a gif library? yes
Does Emacs use a png library? yes
Does Emacs use -lrsvg-2? yes
Does Emacs use cairo? no
Does Emacs use -llcms2? yes
Does Emacs use imagemagick? no
Does Emacs support sound? no
Does Emacs use -lgpm? no
Does Emacs use -ldbus? no
Does Emacs use -lgconf? no
Does Emacs use GSettings? no
Does Emacs use a file notification library? yes (w32)
Does Emacs use access control lists? yes
Does Emacs use -lselinux? no
Does Emacs use -lgnutls? yes
Does Emacs use -lxml2? yes
Does Emacs use -lfreetype? no
Does Emacs use HarfBuzz? yes
Does Emacs use -lm17n-flt? no
Does Emacs use -lotf? no
Does Emacs use -lxft? no
Does Emacs use -lsystemd? no
Does Emacs use -ljansson? yes
Does Emacs use the GMP library? yes
Does Emacs directly use zlib? yes
Does Emacs have dynamic modules support? yes
Does Emacs use toolkit scroll bars? yes
Does Emacs support Xwidgets? no
Does Emacs have threading support in lisp? yes
Does Emacs support the portable dumper? yes
Does Emacs support the legacy unexec dumping? no
Which dumping strategy does Emacs use? pdumper
You are almost there, hang on.
If the output is significantly different, or if configure finishes
prematurely and displays some error message, you should examine the
configuration log in config.log and find the reason for the failure.
Once you succeeded in configuring Emacs, and just want to rebuild it
after updating your local repository from the main repository, you
don't need to re-run the configure script manually, unless you want
to change the configure-time options. Just typing "make" will
re-run configure if necessary with the exact same options you
specified originally, and then go on to invoking Make, described
below.
* Running Make.
This is simple: just type "make" and sit back, watching the fun.
If you installed a snapshot build of Make, the build will be much
faster if you type "make -j N" instead, where N is the number of
independent processing units on your machine. E.g., on a core i7
system try using N of 6 or even 8. (If this hangs, see the notes
above about downgrading to MSYS 1.0.17.)
When Make finishes, you can install the produced binaries:
make install
or, if you want the installed tree to go in a place different from
the configured one, type
make install prefix=WHEREVER
Congrats! You have built and installed your own Emacs!
* Make targets
The following make targets may be used by users building the source
distribution, or users who have checked out of the repository after
an initial bootstrapping.
make
Builds Emacs from the available sources and pre-compiled lisp files.
make install
Installs the built programs and the auxiliary files.
make clean
Removes object and executable files produced by the build process in
the current configuration. After "make clean", you can rebuild with
the same configuration using make. useful when you want to be sure
that all of the products are built from coherent sources.
make distclean
In addition to the files removed by make clean, this also removes
Makefiles and other generated files to get back to the state of a
freshly unpacked source distribution. After make distclean, it is
necessary to run the configure script followed by "make", in order
to rebuild.
The following targets are intended only for use with the repository
sources.
make bootstrap
Removes all the auto-generated files and all the *.elc byte-compiled
files, and builds Emacs from scratch. Useful when some change in
basic Emacs functionality makes byte compilation of updated files
fail.
make maintainer-clean
Removes everything that can be recreated, including compiled Lisp
files, to get back to the state of a fresh repository tree. After make
maintainer-clean, it is necessary to run configure and "make" or
"make bootstrap" to rebuild. Occasionally it may be necessary to
run this target after an update.
* Optional image library support
In addition to its "native" image formats (pbm and xbm), Emacs can
handle other image types: xpm, tiff, gif, png, jpeg and experimental
support for svg.
To build Emacs with support for them, the corresponding headers must
be in the include path and libraries should be where the linker
looks for them, when the configure script is run. If needed, this
can be set up using the CPPFLAGS and CFLAGS variable specified on
the configure command line. The configure script will report
whether it was able to detect the headers and libraries. If the
results of this testing appear to be incorrect, please look for
details in the file config.log: it will show the failed test
programs and compiler error messages that should explain what is
wrong. (Usually, any such failures happen because some headers are
missing due to bad packaging of the image support libraries.)
Note that any file path passed to the compiler or linker must use
forward slashes, or double each backslash, as that is how Bash
works.
If the configure script finds the necessary headers and libraries,
but they are for some reason incompatible, or if you want to omit
support for some image library that is installed on your system for
some other reason, use the --without-PACKAGE option to configure,
such as --without-gif to omit GIF, --without-tiff to omit TIFF, etc.
Passing the --help option to the configure script displays all of
the supported --without-PACKAGE options.
To use the external image support, the DLLs implementing the
functionality must be found when Emacs first needs them, either on the
PATH, or in the same directory as emacs.exe. Failure to find a
library is not an error; the associated image format will simply be
unavailable. Note that once Emacs has determined that a library can
not be found, there's no way to force it to try again, other than
restarting. See the variable `dynamic-library-alist' to configure the
expected names of the libraries.
Some image libraries have dependencies on one another, or on zlib.
For example, tiff support depends on the jpeg library. If you did not
compile the libraries yourself, you must make sure that any dependency
is in the PATH or otherwise accessible and that the binaries are
compatible (for example, that they were built with the same compiler).
To support XPM images (required for color tool-bar icons), you will
need the libXpm library. It is available from the ezwinports site,
http://sourceforge.net/projects/ezwinports/files/ and from
https://ftp.gnu.org/gnu/emacs/windows/.
For PNG images, we recommend to use versions 1.4.x and later of
libpng, because previous versions had security issues. You can find
precompiled libraries and headers on the ezwinports site and on
ftp.gnu.org.
Versions 1.4.0 and later of libpng are binary incompatible with
earlier versions, so Emacs will only look for libpng libraries which
are compatible with the version it was compiled against. That
version is given by the value of the Lisp variable `libpng-version';
e.g., 10403 means version 1.4.3. The variable `dynamic-library-alist'
is automatically set to name only those DLL names that are known to
be compatible with the version given by `libpng-version'. If PNG
support does not work for you even though you have the support DLL
installed, check the name of the installed DLL against
`dynamic-library-alist' and the value of `libpng-version', and
download compatible DLLs if needed.
For GIF images, we recommend to use versions 5.0.0 or later of
giflib, as it is much enhanced wrt previous versions. You can find
precompiled binaries and headers for giflib on the ezwinports site,
http://sourceforge.net/projects/ezwinports/files/ and on
https://ftp.gnu.org/gnu/emacs/windows/.
Version 5.0.0 and later of giflib are binary incompatible with
previous versions (the signatures of several functions have
changed), so Emacs will only look for giflib libraries that are
compatible with the version it was compiled against. Similar to
libpng, that version is given by the value of the Lisp variable
`libgif-version'; e.g., 50005 means version 5.0.5. The variable
`dynamic-library-alist' is automatically set to name only those DLL
libraries that are known to be compatible with the version given by
`libgif-version'.
For JPEG images, you will need libjpeg 6b or later, which will be
called libjpeg-N.dll, jpeg62.dll, libjpeg.dll, or jpeg.dll. You can
find these on the ezwinports site and on ftp.gnu.org.
TIFF images require libTIFF 3.0 or later, which will be called
libtiffN.dll or libtiff-N.dll or libtiff.dll. These can be found on
the ezwinports site.
Pre-built versions of librsvg and its dependencies can be found
here:
http://sourceforge.net/projects/ezwinports/files/
This site includes a minimal (as much as possible for librsvg)
build of the library and its dependencies; it is also more
up-to-date with the latest upstream versions. However, it
currently only offers 32-bit builds. For building Emacs, you need
to download from this site all of the following *-bin.zip
archives:
librsvg, gdk-pixbuf, cairo, glib
The 'bin' archives on this site include both header files and the
libraries needed for building with librsvg and for running Emacs.
The librsvg archive includes all the shared libraries needed to
run Emacs with SVG support; the other 3 packages are required
because the compiler needs to see their header files when building
Emacs.
https://ftp.gnu.org/gnu/emacs/windows/
More fat ports, from the MSYS2 project.
To use librsvg at runtime, ensure that librsvg and its dependencies
are on your PATH, or in the same directory as the emacs.exe binary.
If you are downloading from the ezwinports site, you only need to
install a single archive, librsvg-X.Y.Z-w32-bin.zip, which includes
all the dependency DLLs.
If you think you've got all the dependencies and SVG support is
still not working, check your PATH for other libraries that shadow
the ones you downloaded. Libraries of the same name from different
sources may not be compatible, this problem was encountered in the
past, e.g., with libcroco from gnome.org.
If you can see etc/images/splash.svg, then you have managed to get
SVG support working. Congratulations for making it through DLL hell
to this point. For some SVG images, you'll probably see error
messages from Glib about failed assertions, or warnings from Pango
about failure to load fonts (installing the missing fonts should fix
the latter kind of problems). Problems have been observed in some
images that contain text, they seem to be a problem in the Windows
port of Pango, or maybe a problem with the way Cairo or librsvg is
using it that doesn't show up on other platforms. However, Emacs
should not crash due to these issues. If you eventually find the
SVG support too unstable to your taste, you can rebuild Emacs
without it by specifying the --without-rsvg switch to the configure
script.
Binaries for the other image libraries can be found on the
ezwinports site or at the GnuWin32 project (the latter are generally
very old, so not recommended). Note specifically that, due to some
packaging snafus in the GnuWin32-supplied image libraries, you will
need to download _source_ packages for some of the libraries in
order to get the header files necessary for building Emacs with
image support.
* Optional GnuTLS support
To compile with GnuTLS, you will need pkg-config to be installed, as
the configure script invokes pkg-config to find out which compiler
switches to use for GnuTLS. See above for the URL where you can
find pkg-config for Windows.
You will also need to install the p11-kit package, which is a
dependency of GnuTLS, and its header files are needed for
compilation of programs that use GnuTLS. You can find p11-kit on
the same site as GnuTLS, see the URL below.
If the configure script finds the GnuTLS header files and libraries
on your system, Emacs is built with GnuTLS support by default; to
avoid that you can pass the argument --without-gnutls.
In order to support GnuTLS at runtime, a GnuTLS-enabled Emacs must
be able to find the relevant DLLs during startup; failure to do so
is not an error, but GnuTLS won't be available to the running
session.
You can get pre-built binaries (including any required DLL and the
header files) at http://sourceforge.net/projects/ezwinports/files/
and on https://ftp.gnu.org/gnu/emacs/windows/.
* Optional libxml2 support
To compile with libxml2, you will need pkg-config to be installed,
as the configure script invokes pkg-config to find out which
compiler switches to use for libxml2. See above for the URL where
you can find pkg-config for Windows.
If the configure script finds the libxml2 header files and libraries
on your system, Emacs is built with libxml2 support by default; to
avoid that you can pass the argument --without-libxml2.
In order to support libxml2 at runtime, a libxml2-enabled Emacs must
be able to find the relevant DLLs during startup; failure to do so
is not an error, but libxml2 features won't be available to the
running session.
One place where you can get pre-built Windows binaries of libxml2
(including any required DLL and the header files) is here:
http://sourceforge.net/projects/ezwinports/files/
https://ftp.gnu.org/gnu/emacs/windows/
For runtime support of libxml2, you will also need to install the
libiconv "development" tarball, because the libiconv headers need to
be available to the compiler when you compile with libxml2 support.
A MinGW port of libiconv can be found on the MinGW site:
http://sourceforge.net/projects/mingw/files/MinGW/Base/libiconv/
You need the libiconv-X.Y.Z-N-mingw32-dev.tar.lzma tarball from that
site.
* Optional support for decompressing text
Emacs can decompress text if compiled with the zlib library.
Prebuilt binaries of zlib DLL (for 32-bit builds of Emacs) are
available from the ezwinports site and on ftp.gnu.org; see above for
the URLs.
(This library is also a prerequisite for several image libraries, so
you may already have it; look for zlib1.dll or libz-1.dll.)
* Optional support for lcms2 library
Emacs can expose some capabilities of the Little CMS color
management engine to Lisp programs using the lcms2 library.
Prebuilt binaries of lcms2 DLL (for 32-bit builds of Emacs) are
available from the ezwinports site and from the MSYS2 project.
* Optional support for JSON
Emacs can provide built-in support for JSON parsing and
serialization using the libjansson library. Prebuilt binaries of
the libjansson DLL (for 32-bit builds of Emacs) are available from
the ezwinports site and from the MSYS2 project.
* Optional support for HarfBuzzz shaping library
Emacs supports display of complex scripts and Arabic shaping. The
preferred library for that is HarfBuzz; prebuilt binaries are
available from the ezwinports site (for 32-bit builds of Emacs) and
from the MSYS2 project. If HarfBuzz is not available, Emacs will
use the Uniscribe shaping engine that is part of MS-Windows.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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