install.doc

GNU 系统开发的基于Iz77语法的压缩 学习lz77压缩算法

This is a generic INSTALL file for utilities distributions.
Some features specific to gzip have been added.

To compile this package:

1.  Configure the package for your system.  In the directory that this
file is in, type `./configure'.  If you're using `csh' on an old
version of System V, you might need to type `sh configure' instead to
prevent `csh' from trying to execute `configure' itself.

The `configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation, and
creates the Makefile(s) (one in each subdirectory of the source
directory).  In some packages it creates a C header file containing
system-dependent definitions.  It also creates a file `config.status'
that you can run in the future to recreate the current configuration.

Running `configure' takes a minute or two.  While it is running, it
prints some messages that tell what it is doing.  If you don't want to
see the messages, run `configure' with its standard output redirected
to `/dev/null'; for example, `./configure >/dev/null'.

To compile the package in a different directory from the one
containing the source code, you must use a version of make that
supports the VPATH variable, such as GNU make.  `cd' to the directory
where you want the object files and executables to go and run
`configure'.  `configure' automatically checks for the source code in
the directory that `configure' is in and in `..'.  If for some reason
`configure' is not in the source code directory that you are
configuring, then it will report that it can't find the source code.
In that case, run `configure' with the option `--srcdir=DIR', where
DIR is the directory that contains the source code.

By default, `make install' will install the package's files in
/usr/local/bin, /usr/local/lib, /usr/local/man, etc.  You can specify
an installation prefix other than /usr/local by giving `configure' the
option `--prefix=PATH', for example:
	./configure --prefix=/usr/gnu

Alternately, you can do so by giving a value for the `prefix' variable
when you run `make', e.g.,
	make prefix=/usr/gnu  install

You can specify separate installation prefixes for
architecture-specific files and architecture-independent files.  If
you give `configure' the option `--exec_prefix=PATH' or set the
`make' variable `exec_prefix' to PATH, the package will use PATH as
the prefix for installing programs and libraries.  Shell scripts, data
files and documentation will still use the regular prefix.  Normally,
all files are installed using the regular prefix.

You can tell `configure' to figure out the configuration for your
system, and record it in `config.status', without actually configuring
the package (creating `Makefile's and perhaps a configuration header
file).  To do this, give `configure' the `--no-create' option.  Later,
you can run `./config.status' to actually configure the package.  This
option is useful mainly in `Makefile' rules for updating `config.status'
and `Makefile'.  You can also give `config.status' the `--recheck'
option, which makes it re-run `configure' with the same arguments you
used before.  This is useful if you change `configure'.

`configure' ignores any other arguments that you give it.

If your system requires unusual options for compilation or linking
that `configure' doesn't know about, you can give `configure' initial
values for some variables by setting them in the environment.  In
Bourne-compatible shells, you can do that on the command line like
this:
	CC='gcc -traditional' DEFS=-D_POSIX_SOURCE ./configure

For csh compatible shells, you can do something like this:

	(setenv CC 'gcc -traditional' ; ./configure)

The `make' variables that you might want to override with environment
variables when running `configure' are:

(For these variables, any value given in the environment overrides the
value that `configure' would choose:)
CC		C compiler program.
		Default is `cc', or `gcc' if `gcc' is in your PATH.
INSTALL		Program to use to install files.
		Default is `install' if you have it, `cp' otherwise.

(For these variables, any value given in the environment is added to
the value that `configure' chooses:)
DEFS		Configuration options, in the form `-Dfoo -Dbar ...'
LIBS		Libraries to link with, in the form `-lfoo -lbar ...'

If you need to do unusual things to compile the package, we encourage
you to figure out how `configure' could check whether to do them, and
mail diffs or instructions to the address given in the README so we
can include them in the next release.

On Xenix, some preprocessors do not define M_XENIX. You may have to do:

	DEFS='-DM_XENIX' ./configure

2.  Type `make' to compile the package.  If you want, you can override
the `make' variables CFLAGS and LDFLAGS like this:

	make CFLAGS=-O2 LDFLAGS=-s

Try this if you get an error such as "ld: No such file or directory for libg"
which means that your system is not correctly set up to handle the -g option.

3.  The package comes with self-tests. If you want to run them,
type `make check'.

4.  Type `make install' to install programs, data files, and
documentation. This creates links between gzip, gunzip and zcat.
You can create additional links uncompress, ungzip and gzcat if
you prefer these names. You can also create links to unpack and pcat
if your system uses packed files by default and you want to transform
them transparently to gzip'ed files.

The man pages are installed by default with an extension `.1' (one).
If you want the extension `.l' (lower case L) use:

	make manext=l install

5.  You can remove the program binaries and object files from the
source directory by typing `make clean'.  To also remove the
Makefile(s), the header file containing system-dependent definitions
(if the package uses one), and `config.status' (all the files that
`configure' created), type `make distclean'.

The file `configure.in' is used as a template to create `configure' by
a program called `autoconf'.  You will only need it if you want to
regenerate `configure' using a newer version of `autoconf'.
Some bugs in autoconf have been fixed before generating `configure',
so you may not get exactly the same output.

6.  You  can add the following  lines  to your  /etc/magic file so that
file(1), if  your system supports it,  will recognize files created by
gzip:

0	short		0x1f8b		gzip compressed data
>2	byte		8		- deflate method
>3	byte		&0x1		, ascii
>3	byte		&0x2		, continuation
>3	byte		&0x4		, extra field
>3	byte		&0x8		, original file name
>3	byte		&0x10		, comment
>3	byte		&0x20		, encrypted
>8	byte		2		, max compression
>8	byte		4		, max speed

If your machine is a 386 or a Vax (little-endian machine), replace the
first line with:

0	short		0x8b1f		gzip compressed data

There is no portable way working on both little-endian and
big-endian machines, since SVR4 does not like the string \037\213
as a magic number.