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Module::Build(3pm)                    Perl Programmers Reference Guide                    Module::Build(3pm)



NAME
       Module::Build - Build and install Perl modules

SYNOPSIS
       Standard process for building & installing modules:

         perl Build.PL
         ./Build
         ./Build test
         ./Build install

       Or, if you're on a platform (like DOS or Windows) that doesn't require the "./" notation, you can do
       this:

         perl Build.PL
         Build
         Build test
         Build install

DESCRIPTION
       "Module::Build" is a system for building, testing, and installing Perl modules.  It is meant to be an
       alternative to "ExtUtils::MakeMaker".  Developers may alter the behavior of the module through
       subclassing in a much more straightforward way than with "MakeMaker".  It also does not require a
       "make" on your system - most of the "Module::Build" code is pure-perl and written in a very cross-platform crossplatform
       platform way.  In fact, you don't even need a shell, so even platforms like MacOS (traditional) can
       use it fairly easily.  Its only prerequisites are modules that are included with perl 5.6.0, and it
       works fine on perl 5.005 if you can install a few additional modules.

       See "MOTIVATIONS" for more comparisons between "ExtUtils::MakeMaker" and "Module::Build".

       To install "Module::Build", and any other module that uses "Module::Build" for its installation
       process, do the following:

         perl Build.PL       # 'Build.PL' script creates the 'Build' script
         ./Build             # Need ./ to ensure we're using this "Build" script
         ./Build test        # and not another one that happens to be in the PATH
         ./Build install

       This illustrates initial configuration and the running of three 'actions'.  In this case the actions
       run are 'build' (the default action), 'test', and 'install'.  Other actions defined so far include:

       <action_list>

       You can run the 'help' action for a complete list of actions.

GUIDE TO DOCUMENTATION
       The documentation for "Module::Build" is broken up into three sections:

       General Usage (Module::Build)
           This is the document you are currently reading. It describes basic usage and background
           information.  Its main purpose is to assist the user who wants to learn how to invoke and control
           "Module::Build" scripts at the command line.

       Authoring Reference (Module::Build::Authoring)
           This document describes the structure and organization of "Module::Build", and the relevant
           concepts needed by authors who are writing Build.PL scripts for a distribution or controlling
           "Module::Build" processes programmatically.

       API Reference (Module::Build::API)
           This is a reference to the "Module::Build" API.

       Cookbook (Module::Build::Cookbook)
           This document demonstrates how to accomplish many common tasks.  It covers general command line
           usage and authoring of Build.PL scripts.  Includes working examples.

ACTIONS
       There are some general principles at work here.  First, each task when building a module is called an
       "action".  These actions are listed above; they correspond to the building, testing, installing,
       packaging, etc., tasks.

       Second, arguments are processed in a very systematic way.  Arguments are always key=value pairs.
       They may be specified at "perl Build.PL" time (i.e. "perl Build.PL destdir=/my/secret/place"), in
       which case their values last for the lifetime of the "Build" script.  They may also be specified when
       executing a particular action (i.e.  "Build test verbose=1"), in which case their values last only
       for the lifetime of that command.  Per-action command line parameters take precedence over parameters
       specified at "perl Build.PL" time.

       The build process also relies heavily on the "Config.pm" module.  If the user wishes to override any
       of the values in "Config.pm", she may specify them like so:

         perl Build.PL --config cc=gcc --config ld=gcc

       The following build actions are provided by default.

       build
           [version 0.01]

           If you run the "Build" script without any arguments, it runs the "build" action, which in turn
           runs the "code" and "docs" actions.

           This is analogous to the "MakeMaker" make all target.

       clean
           [version 0.01]

           This action will clean up any files that the build process may have created, including the
           "blib/" directory (but not including the "_build/" directory and the "Build" script itself).

       code
           [version 0.20]

           This action builds your code base.

           By default it just creates a "blib/" directory and copies any ".pm" and ".pod" files from your
           "lib/" directory into the "blib/" directory.  It also compiles any ".xs" files from "lib/" and
           places them in "blib/".  Of course, you need a working C compiler (probably the same one that
           built perl itself) for the compilation to work properly.

           The "code" action also runs any ".PL" files in your lib/ directory.  Typically these create other
           files, named the same but without the ".PL" ending.  For example, a file lib/Foo/Bar.pm.PL could
           create the file lib/Foo/Bar.pm.  The ".PL" files are processed first, so any ".pm" files (or
           other kinds that we deal with) will get copied correctly.

       config_data
           [version 0.26]

           ...

       diff
           [version 0.14]

           This action will compare the files about to be installed with their installed counterparts.  For
           .pm and .pod files, a diff will be shown (this currently requires a 'diff' program to be in your
           PATH).  For other files like compiled binary files, we simply report whether they differ.

           A "flags" parameter may be passed to the action, which will be passed to the 'diff' program.
           Consult your 'diff' documentation for the parameters it will accept - a good one is "-u":

             ./Build diff flags=-u

       dist
           [version 0.02]

           This action is helpful for module authors who want to package up their module for source
           distribution through a medium like CPAN.  It will create a tarball of the files listed in
           MANIFEST and compress the tarball using GZIP compression.

           By default, this action will use the "Archive::Tar" module. However, you can force it to use
           binary "tar" and "gzip" executables by supplying an explicit "tar" (and optional "gzip")
           parameter:

             ./Build dist --tar C:\path\to\tar.exe --gzip C:\path\to\zip.exe

       distcheck
           [version 0.05]

           Reports which files are in the build directory but not in the MANIFEST file, and vice versa.
           (See manifest for details.)

       distclean
           [version 0.05]

           Performs the 'realclean' action and then the 'distcheck' action.

       distdir
           [version 0.05]

           Creates a "distribution directory" named "$dist_name-$dist_version" (if that directory already
           exists, it will be removed first), then copies all the files listed in the MANIFEST file to that
           directory.  This directory is what the distribution tarball is created from.

       distmeta
           [version 0.21]

           Creates the META.yml file that describes the distribution.

           META.yml is a file containing various bits of metadata about the distribution.  The metadata
           includes the distribution name, version, abstract, prerequisites, license, and various other data
           about the distribution.  This file is created as META.yml in YAML format.  It is recommended that
           the "YAML::Tiny" module be installed to create it.  If the "YAML::Tiny" module is not installed,
           an internal module supplied with Module::Build will be used to write the META.yml file, and this
           will most likely be fine.

           META.yml file must also be listed in MANIFEST - if it's not, a warning will be issued.

           The current version of the META.yml specification can be found at
           http://module-build.sourceforge.net/META-spec-current.html <http://module -
           build.sourceforge.net/META-spec-current.html>

       distsign
           [version 0.16]

           Uses "Module::Signature" to create a SIGNATURE file for your distribution, and adds the SIGNATURE
           file to the distribution's MANIFEST.

       disttest
           [version 0.05]

           Performs the 'distdir' action, then switches into that directory and runs a "perl Build.PL",
           followed by the 'build' and 'test' actions in that directory.

       docs
           [version 0.20]

           This will generate documentation (e.g. Unix man pages and HTML documents) for any installable
           items under blib/ that contain POD.  If there are no "bindoc" or "libdoc" installation targets
           defined (as will be the case on systems that don't support Unix manpages) no action is taken for
           manpages.  If there are no "binhtml" or "libhtml" installation targets defined no action is taken
           for HTML documents.

       fakeinstall
           [version 0.02]

           This is just like the "install" action, but it won't actually do anything, it will just report
           what it would have done if you had actually run the "install" action.

       help
           [version 0.03]

           This action will simply print out a message that is meant to help you use the build process.  It
           will show you a list of available build actions too.

           With an optional argument specifying an action name (e.g. "Build help test"), the 'help' action
           will show you any POD documentation it can find for that action.

       html
           [version 0.26]

           This will generate HTML documentation for any binary or library files under blib/ that contain
           POD.  The HTML documentation will only be installed if the install paths can be determined from
           values in "Config.pm".  You can also supply or override install paths on the command line by
           specifying "install_path" values for the "binhtml" and/or "libhtml" installation targets.

       install
           [version 0.01]

           This action will use "ExtUtils::Install" to install the files from "blib/" into the system.  See
           "INSTALL PATHS" for details about how Module::Build determines where to install things, and how
           to influence this process.

           If you want the installation process to look around in @INC for other versions of the stuff
           you're installing and try to delete it, you can use the "uninst" parameter, which tells
           "ExtUtils::Install" to do so:

             ./Build install uninst=1

           This can be a good idea, as it helps prevent multiple versions of a module from being present on
           your system, which can be a confusing situation indeed.

       installdeps
           [version 0.36]

           This action will use the "cpan_client" parameter as a command to install missing prerequisites.
           You will be prompted whether to install optional dependencies.

           The "cpan_client" option defaults to 'cpan' but can be set as an option or in .modulebuildrc.  It
           must be a shell command that takes a list of modules to install as arguments (e.g. 'cpanp -i' for
           CPANPLUS).  If the program part is a relative path (e.g. 'cpan' or 'cpanp'), it will be located
           relative to the perl program that executed Build.PL.

             /opt/perl/5.8.9/bin/perl Build.PL
             ./Build installdeps --cpan_client 'cpanp -i'
             # installs to 5.8.9

       manifest
           [version 0.05]

           This is an action intended for use by module authors, not people installing modules.  It will
           bring the MANIFEST up to date with the files currently present in the distribution.  You may use
           a MANIFEST.SKIP file to exclude certain files or directories from inclusion in the MANIFEST.
           MANIFEST.SKIP should contain a bunch of regular expressions, one per line.  If a file in the
           distribution directory matches any of the regular expressions, it won't be included in the
           MANIFEST.

           The following is a reasonable MANIFEST.SKIP starting point, you can add your own stuff to it:

             ^_build
             ^Build$
             ^blib
             ~$
             \.bak$
             ^MANIFEST\.SKIP$
             CVS

           See the distcheck and skipcheck actions if you want to find out what the "manifest" action would
           do, without actually doing anything.

       manpages
           [version 0.28]

           This will generate man pages for any binary or library files under blib/ that contain POD.  The
           man pages will only be installed if the install paths can be determined from values in
           "Config.pm".  You can also supply or override install paths by specifying there values on the
           command line with the "bindoc" and "libdoc" installation targets.

       pardist
           [version 0.2806]

           Generates a PAR binary distribution for use with PAR or PAR::Dist.

           It requires that the PAR::Dist module (version 0.17 and up) is installed on your system.

       ppd [version 0.20]

           Build a PPD file for your distribution.

           This action takes an optional argument "codebase" which is used in the generated PPD file to
           specify the (usually relative) URL of the distribution.  By default, this value is the
           distribution name without any path information.

           Example:

             ./Build ppd --codebase "MSWin32-x86-multi-thread/Module-Build-0.21.tar.gz"

       ppmdist
           [version 0.23]

           Generates a PPM binary distribution and a PPD description file.  This action also invokes the
           "ppd" action, so it can accept the same "codebase" argument described under that action.

           This uses the same mechanism as the "dist" action to tar & zip its output, so you can supply
           "tar" and/or "gzip" parameters to affect the result.

       prereq_data
           [version 0.32]

           This action prints out a Perl data structure of all prerequisites and the versions required.  The
           output can be loaded again using "eval()".  This can be useful for external tools that wish to
           query a Build script for prerequisites.

       prereq_report
           [version 0.28]

           This action prints out a list of all prerequisites, the versions required, and the versions
           actually installed.  This can be useful for reviewing the configuration of your system prior to a
           build, or when compiling data to send for a bug report.

       pure_install
           [version 0.28]

           This action is identical to the "install" action.  In the future, though, when "install" starts
           writing to the file $(INSTALLARCHLIB)/perllocal.pod, "pure_install" won't, and that will be the
           only difference between them.

       realclean
           [version 0.01]

           This action is just like the "clean" action, but also removes the "_build" directory and the
           "Build" script.  If you run the "realclean" action, you are essentially starting over, so you
           will have to re-create the "Build" script again.

       retest
           [version 0.2806]

           This is just like the "test" action, but doesn't actually build the distribution first, and
           doesn't add blib/ to the load path, and therefore will test against a previously installed
           version of the distribution.  This can be used to verify that a certain installed distribution
           still works, or to see whether newer versions of a distribution still pass the old regression
           tests, and so on.

       skipcheck
           [version 0.05]

           Reports which files are skipped due to the entries in the MANIFEST.SKIP file (See manifest for
           details)

       test
           [version 0.01]

           This will use "Test::Harness" or "TAP::Harness" to run any regression tests and report their
           results. Tests can be defined in the standard places: a file called "test.pl" in the top-level
           directory, or several files ending with ".t" in a "t/" directory.

           If you want tests to be 'verbose', i.e. show details of test execution rather than just summary
           information, pass the argument "verbose=1".

           If you want to run tests under the perl debugger, pass the argument "debugger=1".

           If you want to have Module::Build find test files with different file name extensions, pass the
           "test_file_exts" argument with an array of extensions, such as "[qw( .t .s .z )]".

           If you want test to be run by "TAP::Harness", rather than "Test::Harness", pass the argument
           "tap_harness_args" as an array reference of arguments to pass to the TAP::Harness constructor.

           In addition, if a file called "visual.pl" exists in the top-level directory, this file will be
           executed as a Perl script and its output will be shown to the user.  This is a good place to put
           speed tests or other tests that don't use the "Test::Harness" format for output.

           To override the choice of tests to run, you may pass a "test_files" argument whose value is a
           whitespace-separated list of test scripts to run.  This is especially useful in development, when
           you only want to run a single test to see whether you've squashed a certain bug yet:

             ./Build test --test_files t/something_failing.t

           You may also pass several "test_files" arguments separately:

             ./Build test --test_files t/one.t --test_files t/two.t

           or use a "glob()"-style pattern:

             ./Build test --test_files 't/01-*.t'

       testall
           [version 0.2807]

           [Note: the 'testall' action and the code snippets below are currently in alpha stage, see
           "/www.nntp.perl.org/group/perl.module.build/2007/03/msg584.html"" in "http: ]

           Runs the "test" action plus each of the "test$type" actions defined by the keys of the
           "test_types" parameter.

           Currently, you need to define the ACTION_test$type method yourself and enumerate them in the
           test_types parameter.

             my $mb = Module::Build->subclass(
               code => q(
                 sub ACTION_testspecial { shift->generic_test(type => 'special'); }
                 sub ACTION_testauthor  { shift->generic_test(type => 'author'); }
               )
             )->new(
               ...
               test_types  => {
                 special => '.st',
                 author  => ['.at', '.pt' ],
               },
               ...

       testcover
           [version 0.26]

           Runs the "test" action using "Devel::Cover", generating a code-coverage report showing which
           parts of the code were actually exercised during the tests.

           To pass options to "Devel::Cover", set the $DEVEL_COVER_OPTIONS environment variable:

             DEVEL_COVER_OPTIONS=-ignore,Build ./Build testcover

       testdb
           [version 0.05]

           This is a synonym for the 'test' action with the "debugger=1" argument.

       testpod
           [version 0.25]

           This checks all the files described in the "docs" action and produces "Test::Harness"-style
           output.  If you are a module author, this is useful to run before creating a new release.

       testpodcoverage
           [version 0.28]

           This checks the pod coverage of the distribution and produces "Test::Harness"-style output. If
           you are a module author, this is useful to run before creating a new release.

       versioninstall
           [version 0.16]

           ** Note: since "only.pm" is so new, and since we just recently added support for it here too,
           this feature is to be considered experimental. **

           If you have the "only.pm" module installed on your system, you can use this action to install a
           module into the version-specific library trees.  This means that you can have several versions of
           the same module installed and "use" a specific one like this:

             use only MyModule => 0.55;

           To override the default installation libraries in "only::config", specify the "versionlib"
           parameter when you run the "Build.PL" script:

             perl Build.PL --versionlib /my/version/place/

           To override which version the module is installed as, specify the "versionlib" parameter when you
           run the "Build.PL" script:

             perl Build.PL --version 0.50

           See the "only.pm" documentation for more information on version-specific installs.

OPTIONS
   Command Line Options
       The following options can be used during any invocation of "Build.PL" or the Build script, during any
       action.  For information on other options specific to an action, see the documentation for the
       respective action.

       NOTE: There is some preliminary support for options to use the more familiar long option style.  Most
       options can be preceded with the "--" long option prefix, and the underscores changed to dashes (e.g.
       "--use-rcfile").  Additionally, the argument to boolean options is optional, and boolean options can
       be negated by prefixing them with "no" or "no-" (e.g. "--noverbose" or "--no-verbose").

       quiet
           Suppress informative messages on output.

       verbose
           Display extra information about the Build on output.

       cpan_client
           Sets the "cpan_client" command for use with the "installdeps" action.  See "installdeps" for more
           details.

       use_rcfile
           Load the ~/.modulebuildrc option file.  This option can be set to false to prevent the custom
           resource file from being loaded.

       allow_mb_mismatch
           Suppresses the check upon startup that the version of Module::Build we're now running under is
           the same version that was initially invoked when building the distribution (i.e. when the
           "Build.PL" script was first run).  As of 0.3601, a mismatch results in a warning instead of a
           fatal error, so this option effectively just suppresses the warning.

       debug
           Prints Module::Build debugging information to STDOUT, such as a trace of executed build actions.

   Default Options File (.modulebuildrc)
       [version 0.28]

       When Module::Build starts up, it will look first for a file, $ENV{HOME}/.modulebuildrc.  If it's not
       found there, it will look in the the .modulebuildrc file in the directories referred to by the
       environment variables "HOMEDRIVE" + "HOMEDIR", "USERPROFILE", "APPDATA", "WINDIR", "SYS$LOGIN".  If
       the file exists, the options specified there will be used as defaults, as if they were typed on the
       command line.  The defaults can be overridden by specifying new values on the command line.

       The action name must come at the beginning of the line, followed by any amount of whitespace and then
       the options.  Options are given the same as they would be on the command line.  They can be separated
       by any amount of whitespace, including newlines, as long there is whitespace at the beginning of each
       continued line.  Anything following a hash mark ("#") is considered a comment, and is stripped before
       parsing.  If more than one line begins with the same action name, those lines are merged into one set
       of options.

       Besides the regular actions, there are two special pseudo-actions: the key "*" (asterisk) denotes any
       global options that should be applied to all actions, and the key 'Build_PL' specifies options to be
       applied when you invoke "perl Build.PL".

         *           verbose=1   # global options
         diff        flags=-u
         install     --install_base /home/ken
                     --install_path html=/home/ken/docs/html
         installdeps --cpan_client 'cpanp -i'

       If you wish to locate your resource file in a different location, you can set the environment
       variable "MODULEBUILDRC" to the complete absolute path of the file containing your options.

   Environment variables
       MODULEBUILDRC
           [version 0.28]

           Specifies an alternate location for a default options file as described above.

       PERL_MB_OPT
           [version 0.36]

           Command line options that are applied to Build.PL or any Build action.  The string is split as
           the shell would (e.g. whitespace) and the result is prepended to any actual command-line
           arguments.

INSTALL PATHS
       [version 0.19]

       When you invoke Module::Build's "build" action, it needs to figure out where to install things.  The
       nutshell version of how this works is that default installation locations are determined from
       Config.pm, and they may be overridden by using the "install_path" parameter.  An "install_base"
       parameter lets you specify an alternative installation root like /home/foo, and a "destdir" lets you
       specify a temporary installation directory like /tmp/install in case you want to create bundled-up
       installable packages.

       Natively, Module::Build provides default installation locations for the following types of
       installable items:

       lib Usually pure-Perl module files ending in .pm.

       arch
           "Architecture-dependent" module files, usually produced by compiling XS, Inline, or similar code.

       script
           Programs written in pure Perl.  In order to improve reuse, try to make these as small as possible
           - put the code into modules whenever possible.

       bin "Architecture-dependent" executable programs, i.e. compiled C code or something.  Pretty rare to
           see this in a perl distribution, but it happens.

       bindoc
           Documentation for the stuff in "script" and "bin".  Usually generated from the POD in those
           files.  Under Unix, these are manual pages belonging to the 'man1' category.

       libdoc
           Documentation for the stuff in "lib" and "arch".  This is usually generated from the POD in .pm
           files.  Under Unix, these are manual pages belonging to the 'man3' category.

       binhtml
           This is the same as "bindoc" above, but applies to HTML documents.

       libhtml
           This is the same as "bindoc" above, but applies to HTML documents.

       Four other parameters let you control various aspects of how installation paths are determined:

       installdirs
           The default destinations for these installable things come from entries in your system's
           "Config.pm".  You can select from three different sets of default locations by setting the
           "installdirs" parameter as follows:

                                     'installdirs' set to:
                              core          site                vendor

                         uses the following defaults from Config.pm:

             lib     => installprivlib  installsitelib      installvendorlib
             arch    => installarchlib  installsitearch     installvendorarch
             script  => installscript   installsitebin      installvendorbin
             bin     => installbin      installsitebin      installvendorbin
             bindoc  => installman1dir  installsiteman1dir  installvendorman1dir
             libdoc  => installman3dir  installsiteman3dir  installvendorman3dir
             binhtml => installhtml1dir installsitehtml1dir installvendorhtml1dir [*]
             libhtml => installhtml3dir installsitehtml3dir installvendorhtml3dir [*]

             * Under some OS (eg. MSWin32) the destination for HTML documents is
               determined by the C<Config.pm> entry C<installhtmldir>.

           The default value of "installdirs" is "site".  If you're creating vendor distributions of module
           packages, you may want to do something like this:

             perl Build.PL --installdirs vendor

           or

             ./Build install --installdirs vendor

           If you're installing an updated version of a module that was included with perl itself (i.e. a
           "core module"), then you may set "installdirs" to "core" to overwrite the module in its present
           location.

           (Note that the 'script' line is different from "MakeMaker" - unfortunately there's no such thing
           as "installsitescript" or "installvendorscript" entry in "Config.pm", so we use the
           "installsitebin" and "installvendorbin" entries to at least get the general location right.  In
           the future, if "Config.pm" adds some more appropriate entries, we'll start using those.)

       install_path
           Once the defaults have been set, you can override them.

           On the command line, that would look like this:

             perl Build.PL --install_path lib=/foo/lib --install_path arch=/foo/lib/arch

           or this:

             ./Build install --install_path lib=/foo/lib --install_path arch=/foo/lib/arch

       install_base
           You can also set the whole bunch of installation paths by supplying the "install_base" parameter
           to point to a directory on your system.  For instance, if you set "install_base" to "/home/ken"
           on a Linux system, you'll install as follows:

             lib     => /home/ken/lib/perl5
             arch    => /home/ken/lib/perl5/i386-linux
             script  => /home/ken/bin
             bin     => /home/ken/bin
             bindoc  => /home/ken/man/man1
             libdoc  => /home/ken/man/man3
             binhtml => /home/ken/html
             libhtml => /home/ken/html

           Note that this is different from how "MakeMaker"'s "PREFIX" parameter works.  "install_base" just
           gives you a default layout under the directory you specify, which may have little to do with the
           "installdirs=site" layout.

           The exact layout under the directory you specify may vary by system - we try to do the "sensible"
           thing on each platform.

       destdir
           If you want to install everything into a temporary directory first (for instance, if you want to
           create a directory tree that a package manager like "rpm" or "dpkg" could create a package from),
           you can use the "destdir" parameter:

             perl Build.PL --destdir /tmp/foo

           or

             ./Build install --destdir /tmp/foo

           This will effectively install to "/tmp/foo/$sitelib", "/tmp/foo/$sitearch", and the like, except
           that it will use "File::Spec" to make the pathnames work correctly on whatever platform you're
           installing on.

       prefix
           Provided for compatibility with "ExtUtils::MakeMaker"'s PREFIX argument.  "prefix" should be used
           when you wish Module::Build to install your modules, documentation and scripts in the same place
           "ExtUtils::MakeMaker" does.

           The following are equivalent.

               perl Build.PL --prefix /tmp/foo
               perl Makefile.PL PREFIX=/tmp/foo

           Because of the very complex nature of the prefixification logic, the behavior of PREFIX in
           "MakeMaker" has changed subtly over time.  Module::Build's --prefix logic is equivalent to the
           PREFIX logic found in "ExtUtils::MakeMaker" 6.30.

           If you do not need to retain compatibility with "ExtUtils::MakeMaker" or are starting a fresh
           Perl installation we recommend you use "install_base" instead (and "INSTALL_BASE" in
           "ExtUtils::MakeMaker").  See "Instaling in the same location as ExtUtils::MakeMaker" in
           Module::Build::Cookbook for further information.

MOTIVATIONS
       There are several reasons I wanted to start over, and not just fix what I didn't like about
       "MakeMaker":

       •   I don't like the core idea of "MakeMaker", namely that "make" should be involved in the build
           process.  Here are my reasons:

           +   When a person is installing a Perl module, what can you assume about their environment?  Can
               you assume they have "make"?  No, but you can assume they have some version of Perl.

           +   When a person is writing a Perl module for intended distribution, can you assume that they
               know how to build a Makefile, so they can customize their build process?  No, but you can
               assume they know Perl, and could customize that way.

           For years, these things have been a barrier to people getting the build/install process to do
           what they want.

       •   There are several architectural decisions in "MakeMaker" that make it very difficult to customize
           its behavior.  For instance, when using "MakeMaker" you do "use ExtUtils::MakeMaker", but the
           object created in "WriteMakefile()" is actually blessed into a package name that's created on the
           fly, so you can't simply subclass "ExtUtils::MakeMaker".  There is a workaround "MY" package that
           lets you override certain "MakeMaker" methods, but only certain explicitly preselected (by
           "MakeMaker") methods can be overridden.  Also, the method of customization is very crude: you
           have to modify a string containing the Makefile text for the particular target.  Since these
           strings aren't documented, and can't be documented (they take on different values depending on
           the platform, version of perl, version of "MakeMaker", etc.), you have no guarantee that your
           modifications will work on someone else's machine or after an upgrade of "MakeMaker" or perl.

       •   It is risky to make major changes to "MakeMaker", since it does so many things, is so important,
           and generally works.  "Module::Build" is an entirely separate package so that I can work on it
           all I want, without worrying about backward compatibility.

       •   Finally, Perl is said to be a language for system administration.  Could it really be the case
           that Perl isn't up to the task of building and installing software?  Even if that software is a
           bunch of stupid little ".pm" files that just need to be copied from one place to another?  My
           sense was that we could design a system to accomplish this in a flexible, extensible, and
           friendly manner.  Or die trying.

TO DO
       The current method of relying on time stamps to determine whether a derived file is out of date isn't
       likely to scale well, since it requires tracing all dependencies backward, it runs into problems on
       NFS, and it's just generally flimsy.  It would be better to use an MD5 signature or the like, if
       available.  See "cons" for an example.

        - append to perllocal.pod
        - add a 'plugin' functionality

AUTHOR
       Ken Williams <kwilliams@cpan.org>

       Development questions, bug reports, and patches should be sent to the Module-Build mailing list at
       <module-build@perl.org>.

       Bug reports are also welcome at <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Module-Build>.

       The latest development version is available from the Subversion repository at
       <https://svn.perl.org/modules/Module-Build/trunk/>

COPYRIGHT
       Copyright (c) 2001-2006 Ken Williams.  All rights reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

SEE ALSO
       perl(1), Module::Build::Cookbook, Module::Build::Authoring, Module::Build::API, ExtUtils::MakeMaker,
       YAML::Tiny

       META.yml Specification: http://module-build.sourceforge.net/META-spec-current.html <http://module -
       build.sourceforge.net/META-spec-current.html>

       <http://www.dsmit.com/cons/>

       <http://search.cpan.org/dist/PerlBuildSystem/>



perl v5.12.5                                     2012-11-03                               Module::Build(3pm)