9 Copyright (c) 2005-2007 Paul Marquess. All rights reserved.
10 This program is free software; you can redistribute it
11 and/or modify it under the same terms as Perl itself.
14 The directory zlib-src contains a subset of the
15 source files copied directly from zlib version 1.2.3.
16 These files are Copyright(C) 1995-2005
17 Jean-loup Gailly and Mark Adler.
18 Full source for the zlib library is available at
27 This module provides a Perl interface to the zlib compression library.
36 Before you can build Compress::Raw::Zlib you need to have the following
37 installed on your system:
42 * Perl 5.004 or better.
46 By default, Compress::Raw::Zlib will build its own private copy of the
47 zlib library. If you want to use a different version of
48 zlib, follow the instructions in the section called
49 "Controlling the version of zlib used by Compress::Raw::Zlib"
50 later in this document.
57 Assuming you have met all the prerequisites, the module can now be built
58 using this sequence of commands:
69 To install Compress::Raw::Zlib, run the command below:
76 Controlling the version of zlib used by Compress::Raw::Zlib
77 ----------------------------------------------------------
79 Compress::Raw::Zlib interfaces to the zlib compression library. There
80 are three options available to control which version/instance of the
83 1. Build a private copy of the zlib library using the
84 zlib library source that is included with this module.
85 This is the default and recommended option.
87 2. Build a private copy of the zlib library using a standard
88 zlib source distribution.
90 3. Use a pre-built zlib library.
92 Note that if you intend to use either Option 2 or 3, you need to have
93 zlib version 1.0.5 or better.
96 The contents of the file config.in are used to control which of the
97 three options is actually used. This file is read during the
101 step of the build, so remember to make any required changes to config.in
102 before building this module.
109 For option 1, edit the file config.in and set the variables in it
116 GZIP_OS_CODE = AUTO_DETECT
122 For option 2, fetch a copy of the zlib source distribution from
123 http://www.zlib.org and unpack it into the Compress::Raw::Zlib source
124 directory. Assuming you have fetched zlib 1.2.3,
125 it will create a directory called zlib-1.2.3.
127 Now set the variables in the file config.in as follows (if the version
128 you have fetched isn't 1.2.3, change the INCLUDE and LIB
129 variables appropriately):
132 INCLUDE = ./zlib-1.2.3
135 GZIP_OS_CODE = AUTO_DETECT
141 For option 3, you need to find out where zlib is stored on your
142 system. There are two parts to this.
144 First, find the directory where the zlib library is stored (some
145 common names for the library are libz.a and libz.so). Set the LIB variable
146 in the config.in file to that directory.
148 Secondly, find the directory where the file zlib.h is stored. Now set
149 the INCLUDE variable in the config.in file to that directory.
151 Next set BUILD_ZLIB to False.
153 Finally, if you are running zlib 1.0.5 or older, set the OLD_ZLIB
154 variable to True. Otherwise set it to False.
156 As an example, if the zlib library on your system is in
157 /usr/local/lib, zlib.h is in /usr/local/include and zlib is more
158 recent than version 1.0.5, the variables in config.in should be set as
162 INCLUDE = /usr/local/include
165 GZIP_OS_CODE = AUTO_DETECT
168 Setting the Gzip OS Code
169 ------------------------
171 Every gzip stream stores a byte in its header to identify the Operating
172 System that was used to create the gzip stream. When you build
173 Compress::Raw::Zlib it will attempt to determine the value that is correct for
174 your Operating System. This will then be used by IO::Gzip as the default
175 value for the OS byte in all gzip headers it creates.
177 The variable GZIP_OS_CODE in the config.in file controls the setting of
178 this value when building Compress::Raw::Zlib. If GZIP_OS_CODE is set to
179 AUTO_DETECT, Compress::Raw::Zlib will attempt to determine the correct value for
180 your Operating System.
182 Alternatively, you can override auto-detection of the default OS code and
183 explicitly set it yourself. Set the GZIP_OS_CODE variable in the config.in
184 file to be a number between 0 and 255. For example
188 See RFC 1952 for valid OS codes that can be used.
190 If you are running one of the less popular Operating Systems, it is
191 possible that the default value picked by this module is incorrect or the
192 default value (3) is used when there is a better value available. When
193 Compress::Raw::Zlib cannot determine what operating system you are running, it
194 will use the default value 3 for the OS code.
196 If you find you have to change this value, because you think the value auto
197 detected is incorrect, please take a few moments to contact the author of
211 Solaris build fails with "language optional software package not installed"
212 ---------------------------------------------------------------------------
214 If you are trying to build this module under Solaris and you get an
215 error message like this
217 /usr/ucb/cc: language optional software package not installed
219 it means that Perl cannot find the C compiler on your system. The cryptic
220 message is just Sun's way of telling you that you haven't bought their
223 When you build a Perl module that needs a C compiler, the Perl build
224 system tries to use the same C compiler that was used to build perl
225 itself. In this case your Perl binary was built with a C compiler that
228 To continue with building this module, you need to get a C compiler,
229 or tell Perl where your C compiler is, if you already have one.
231 Assuming you have now got a C compiler, what you do next will be dependent
232 on what C compiler you have installed. If you have just installed Sun's
233 C compiler, you shouldn't have to do anything. Just try rebuilding
236 If you have installed another C compiler, say gcc, you have to tell perl
237 how to use it instead of /usr/ucb/cc.
239 This set of options seems to work if you want to use gcc. Your mileage
242 perl Makefile.PL CC=gcc CCCDLFLAGS=-fPIC OPTIMIZE=" "
245 If that doesn't work for you, it's time to make changes to the Makefile
251 Solaris build fails with "gcc: unrecognized option `-KPIC'"
252 -----------------------------------------------------------
254 You are running Solaris and you get an error like this when you try to
255 build this Perl module
257 gcc: unrecognized option `-KPIC'
259 This symptom usually means that you are using a Perl binary that has been
260 built with the Sun C compiler, but you are using gcc to build this module.
262 When Perl builds modules that need a C compiler, it will attempt to use
263 the same C compiler and command line options that was used to build perl
264 itself. In this case "-KPIC" is a valid option for the Sun C compiler,
265 but not for gcc. The equivalent option for gcc is "-fPIC".
267 The solution is either:
269 1. Build both Perl and this module with the same C compiler, either
270 by using the Sun C compiler for both or gcc for both.
272 2. Try generating the Makefile for this module like this perl
274 perl Makefile.PL CC=gcc CCCDLFLAGS=-fPIC OPTIMIZE=" " LD=gcc
277 This second option seems to work when mixing a Perl binary built
278 with the Sun C compiler and this module built with gcc. Your
284 I've had a report that when building Compress::Raw::Zlib under HP-UX that it
285 is necessary to have first built the zlib library with the -fpic
295 Although most Linux distributions already come with zlib, some
296 people report getting this error when they try to build this module:
299 cp Zlib.pm blib/lib/Compress/Zlib.pm
300 AutoSplitting blib/lib/Compress/Zlib.pm (blib/lib/auto/Compress/Zlib)
301 /usr/bin/perl -I/usr/lib/perl5/5.6.1/i386-linux -I/usr/lib/perl5/5.6.1 /usr/lib/perl5/5.6.1/ExtUtils/xsubpp -typemap /usr/lib/perl5/5.6.1/ExtUtils/typemap -typemap typemap Zlib.xs > Zlib.xsc && mv Zlib.xsc Zlib.c
302 gcc -c -I/usr/local/include -fno-strict-aliasing -I/usr/local/include -O2 -march=i386 -mcpu=i686 -DVERSION=\"1.16\" -DXS_VERSION=\"1.16\" -fPIC -I/usr/lib/perl5/5.6.1/i386-linux/CORE Zlib.c
303 Zlib.xs:25:19: zlib.h: No such file or directory
304 make: *** [Zlib.o] Error 1
306 This usually means that you have not installed the development RPM
307 for zlib. Check for an RPM that start with "zlib-devel" in your Linux
316 If you are running Activestate Perl (from http://www.activestate.com),
317 it ships with a pre-compiled version of Compress::Raw::Zlib. To check if a
318 newer version of Compress::Raw::Zlib is available run this from the command
321 C:\> ppm verify -upgrade Compress-Zlib
324 If you are not running Activestate Perl and you don't have access
325 to a C compiler, you will not be able to build and install this module.
333 It is not possible to install Compress::Raw::Zlib using the CPAN shell.
334 This is because the Compress::Raw::Zlib DLL is itself used by the CPAN shell
335 and it is impossible to remove a DLL while it is already loaded under
338 The workaround is to install Compress::Raw::Zlib manually using the
339 instructions given at the start of this file.
345 How to report a problem with Compress::Raw::Zlib.
347 To help me help you, I need all of the following information:
349 1. The Versions of everything relevant.
352 a. The *complete* output from running this
356 Do not edit the output in any way.
357 Note, I want you to run "perl -V" and NOT "perl -v".
359 If your perl does not understand the "-V" option it is too
360 old. This module needs Perl version 5.004 or better.
362 b. The version of Compress::Raw::Zlib you have.
363 If you have successfully installed Compress::Raw::Zlib, this one-liner
366 perl -MCompress::Raw::Zlib -e 'print qq[ver $Compress::Raw::Zlib::VERSION\n]'
368 If you areplete* output from running this
372 Do not edit the output in any way.
373 Note, I want you to run "perl -V" and NOT "perl -v".
375 If your perl does not understand the "-V" option it is too
376 old. This module needs Perl version 5.004 or better.
378 b. The version of Compress::Raw::Zlib you have.
379 If you have successfully installed Compress::Raw::Zlib, this one-liner
382 perl -MCompress::Raw::Zlib -e 'print qq[ver $Compress::Raw::Zlib::VERSION\n]'
384 If you are running windows use this
386 perl -MCompress::Raw::Zlib -e "print qq[ver $Compress::Raw::Zlib::VERSION\n]"
388 If you haven't installed Compress::Raw::Zlib then search Compress::Raw::Zlib.pm
389 for a line like this:
394 c. The version of zlib you have installed.
395 If you have successfully installed Compress::Raw::Zlib, this one-liner
398 perl -MCompress::Raw::Zlib -e "print q[zlib ver ]. Compress::Raw::Zlib::ZLIB_VERSION.qq[\n]"
401 If not, look at the beginning of the file zlib.h.
404 2. If you are having problems building Compress::Raw::Zlib, send me a
405 complete log of what happened. Start by unpacking the Compress::Raw::Zlib
406 module into a fresh directory and keep a log of all the steps
408 [edit config.in, if necessary]
411 make test TEST_VERBOSE=1
414 Paul Marquess <pmqs@cpan.org>