mirror of
https://github.com/moparisthebest/wget
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181 lines
8.4 KiB
Plaintext
181 lines
8.4 KiB
Plaintext
-*- text -*-
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GNU Wget Installation Procedure
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===============================
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0. Introduction
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---------------
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This document describes how to build Wget from source code on
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Unix-like systems. If you want to install a precompiled Wget, this
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document is not for you -- refer to the documentation provided by the
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distributors instead. If you already have Wget and want to learn how
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to use it, refer to Wget's Info documentation or man page which you
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should have received with your system. If you are using Windows
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(except for Cygwin), read windows/README instead. If you want to
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compile Wget from source code on a Unix-like system, read on.
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The preferred form of building Wget is to get a release archive and
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unpack it (which you have presumably done, since you are reading
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this). If you have obtained the source code via the Subversion
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repository, please follow the instructions in `README.checkout' before
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continuing.
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1. Dependencies
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---------------
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To build Wget, your system must support a Unix-like command-line
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development environment, including the text-processing utilities (sh,
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grep, awk, sed, etc.) and a functional C compiler. On some GNU/Linux
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systems, this means that you will need to install packages such as
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`gcc', `glibc-devel' (or `libc6-dev') and `make'. Most systems come
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with these packages preinstalled, but it doesn't hurt to check. If
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you have successfully compiled other software from source, you
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probably have them all.
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In addition to the C development environment, Wget can use a number of
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optional libraries to provide additional features, such as translated
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messages and support for "https" URLs. The "external" dependencies
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include:
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- OpenSSL -- for "https" URLs.
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- GNU gettext -- for translated messages.
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To be usable for building Wget, the listed libraries must be installed
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with their "development" header files. On GNU/Linux systems this
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typically means installing the corredponsing "lib<name>-devel" or
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"lib<name>-dev" package along with the package with "lib<name>".
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2. Configuration
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----------------
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Before compiling Wget, you need to "configure" it using the
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`configure' script provided with the distribution. Configuration
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serves two distinct purposes: it enables Wget's build system to
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inspect certain features of your operating system for more robust
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compilation, and it enables you to choose which features you want the
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resulting Wget to have.
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As is the case with most GNU software, Wget's configure script was
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generated with GNU Autoconf. If you're not familiar with
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Autoconf-generated scripts, read on.
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The most straightforward way to configure Wget is by running the
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configure script without any arguments. After running some
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compilation-related tests, it will create the Makefiles needed to
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build Wget. However, you may wish to customize Wget's configuration
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by providing arguments to `configure'. Wget's configure script
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accepts standard Autoconf arguments, the most important ones being:
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--help display a help message and exit
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--prefix=PREFIX install architecture-independent files in PREFIX
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(/usr/local by default)
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--bindir=DIR user executables in DIR (PREFIX/bin)
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--infodir=DIR info documentation in DIR [PREFIX/info]
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--mandir=DIR man documentation in DIR [PREFIX/man]
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For example, if you are not root and want to install Wget in
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subdirectories of your home directory, you can use:
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./configure --prefix=$HOME
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In addition to the above generic options, Wget's configuration
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supports a number of options more or less specific to Wget. Options
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beginning with "--disable", such as `--disable-opie' or
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`--disable-ntlm', allow you to turn off certain built-in functionality
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you don't need in order to reduce the size of the executable. Options
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beginning with "--with" turning off autodetection and use of external
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software Wget can link with, such as the SSL libraries. Recognized
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"--enable" and "--with" options include:
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--without-ssl disable SSL autodetection (used for https support)
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--with-libssl-prefix=DIR search for libssl in DIR/lib
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--disable-opie disable support for opie or s/key FTP login
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--disable-digest disable support for HTTP digest authorization
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--disable-ntlm disable support for HTTP NTLM authorization
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--disable-debug disable support for debugging output
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--disable-nls do not use Native Language Support
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--disable-largefile omit support for large files
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--disable-ipv6 disable IPv6 support
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--disable-rpath do not hardcode runtime library paths
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You can inspect decisions made by configure by editing the generated
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Makefiles and the `src/config.h' include file. The defaults should
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work without intervention, but if you know what you are doing, editing
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the generated files before compilation is fine -- they will not be
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regenerated until you run configure again.
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`configure' will try to find a compiler in your PATH, defaulting to
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`gcc', but falling back to `cc' if the former is unavailable. This is
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a reasonable default on most Unix-like systems, but sometimes you
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might want to override it. The compiler choice is overridden by
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setting the `CC' environment variable to the desired compiler file
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name. For example, to force compilation with the Unix `cc' compiler,
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invoke configure like this:
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./configure CC=cc
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This assumes that `cc' is in your path -- if it is not, simply use
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CC=/path/to/cc instead. Note that environment variables that affect
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configure can be set with the usual shell syntax `VAR=value
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./configure' (assuming sh syntax), but can also be specified as
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arguments to configure, as shown above. The latter method, while
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being specific to configure, works unmodified in all shells.
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Environment variables that affect `configure' include: CFLAGS for C
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compiler flags, CPPFLAGS for C preprocessor flags, LDFLAGS for linker
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flags, and LIBS for libraries.
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Barring the use of --without-* flags, configure will try to autodetect
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external libraries needed by Wget, currently only the OpenSSL
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libraries. If they are installed in the system library directories or
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in the same prefix where you plan to install Wget, configure should be
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able to autodetect them. If they are installed elsewhere, use the
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`--with-libNAME' option to specify the root directory under which
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libraries reside in the `lib/' subdirectory and the corresponding
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header files reside in the `include/' subdirectory. For example, if
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the OpenSSL libraries are installed under the /usr/local/ssl prefix,
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use `--with-libssl=/usr/local/ssl'.
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Sometimes external libraries will be installed on the system, but the
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header files will be missing. This often happens on GNU/Linux if you
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forget to install the "-devel" or "-dev" package that corresponds to
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the library and that is typically *not* installed by default. In that
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case configure will not find the library and you will not be able to
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use the features provided by the library until you install the devel
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package and rerun configure. If you believe you have the necessary
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headers, but configure still fails to detect the library, please
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report it as a bug.
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3. Compilation
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--------------
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To compile GNU Wget after it has been configured, simply type make.
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Wget requires a compiler and standard library compliant with the 1990
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ISO C standard, which includes the vast majority of compilation
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environments present on systems in use today.
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After the compilation a ready-to-use `wget' executable should reside
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in the src directory. At this point there is no formal test suite for
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testing the binary, but it should be easy enough to test whether the
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basic functionality works.
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4. Installation
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---------------
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Use `make install' to install GNU Wget to directories specified to
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configure. To install it in a system directory (which is the
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default), you will need to be root. The standard prefix is
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"/usr/local/", which can be changed using the `--prefix' configure
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option.
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The installation process will copy the wget binary to $PREFIX/bin,
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install the wget.info* info pages to $PREFIX/info, the generated
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manual page (where available) wget.1 to $PREFIX/man/man1, and the
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default config file to $PREFIX/etc, unless a config file already
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exists there. You can customize these directories either through the
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configuration process or making the necessary changes in the Makefile.
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To delete the files created by Wget installation, you can use `make
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uninstall'.
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