/> results from the CPAN

Acme-Sort-Sleep

Specifies the licensing terms of your distribution.

As of Module::Build version 0.36_14, you may use a L<Software::License>
subclass name (e.g. 'Apache_2_0') instead of one of the keys below.

The legacy list of valid license values include:

=over 4

=item apache

The distribution is licensed under the Apache License, Version 2.0
(L<http://apache.org/licenses/LICENSE-2.0>).

=item apache_1_1

The distribution is licensed under the Apache Software License, Version 1.1
(L<http://apache.org/licenses/LICENSE-1.1>).

=item artistic

The distribution is licensed under the Artistic License, as specified
by the F<Artistic> file in the standard Perl distribution.

=item artistic_2

The distribution is licensed under the Artistic 2.0 License
(L<http://opensource.org/licenses/artistic-license-2.0.php>.)

=item bsd

The distribution is licensed under the BSD License
(L<http://www.opensource.org/licenses/bsd-license.php>).

=item gpl

The distribution is licensed under the terms of the GNU General
Public License (L<http://www.opensource.org/licenses/gpl-license.php>).

=item lgpl

The distribution is licensed under the terms of the GNU Lesser
General Public License
(L<http://www.opensource.org/licenses/lgpl-license.php>).

=item mit

The distribution is licensed under the MIT License
(L<http://opensource.org/licenses/mit-license.php>).

=item mozilla

The distribution is licensed under the Mozilla Public
License.  (L<http://opensource.org/licenses/mozilla1.0.php> or
L<http://opensource.org/licenses/mozilla1.1.php>)

=item open_source

The distribution is licensed under some other Open Source
Initiative-approved license listed at
L<http://www.opensource.org/licenses/>.

=item perl

The distribution may be copied and redistributed under the same terms
as Perl itself (this is by far the most common licensing option for
modules on CPAN).  This is a dual license, in which the user may
choose between either the GPL or the Artistic license.

=item restrictive

The distribution may not be redistributed without special permission
from the author and/or copyright holder.

=item unrestricted

The distribution is licensed under a license that is B<not> approved
by www.opensource.org but that allows distribution without
restrictions.

=back

Note that you must still include the terms of your license in your
code and documentation - this field only sets the information that is included
in distribution metadata to let automated tools figure out your
licensing restrictions.  Humans still need something to read.  If you
choose to provide this field, you should make sure that you keep it in
sync with your written documentation if you ever change your licensing
terms.

You may also use a license type of C<unknown> if you don't wish to
specify your terms in the metadata.

Also see the C<create_license> parameter.

=item meta_add

[version 0.28]

A hash of key/value pairs that should be added to the F<META.yml> file
during the C<distmeta> action.  Any existing entries with the same
names will be overridden.

See the L</"MODULE METADATA"> section for details.

=item meta_merge

[version 0.28]

A hash of key/value pairs that should be merged into the F<META.yml>
file during the C<distmeta> action.  Any existing entries with the
same names will be overridden.

The only difference between C<meta_add> and C<meta_merge> is their
behavior on hash-valued and array-valued entries: C<meta_add> will
completely blow away the existing hash or array value, but
C<meta_merge> will merge the supplied data into the existing hash or
array value.

See the L</"MODULE METADATA"> section for details.

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN


=item needs_compiler

[version 0.36]

The C<needs_compiler> parameter indicates whether a compiler is required to
build the distribution.  The default is false, unless XS files are found or
the C<c_source> parameter is set, in which case it is true.  If true,
L<ExtUtils::CBuilder> is automatically added to C<build_requires> if needed.

For a distribution where a compiler is I<optional>, e.g. a dual XS/pure-Perl
distribution, C<needs_compiler> should explicitly be set to a false value.

=item PL_files

[version 0.06]

An optional parameter specifying a set of C<.PL> files in your
distribution.  These will be run as Perl scripts prior to processing
the rest of the files in your distribution with the name of the file
they're generating as an argument.  They are usually used as templates
for creating other files dynamically, so that a file like
C<lib/Foo/Bar.pm.PL> might create the file C<lib/Foo/Bar.pm>.

The files are specified with the C<.PL> files as hash keys, and the
file(s) they generate as hash values, like so:

  my $build = Module::Build->new
    (
     module_name => 'Foo::Bar',
     ...
     PL_files => { 'lib/Foo/Bar.pm.PL' => 'lib/Foo/Bar.pm' },
    );

Note that the path specifications are I<always> given in Unix-like
format, not in the style of the local system.

If your C<.PL> scripts don't create any files, or if they create files
with unexpected names, or even if they create multiple files, you can
indicate that so that Module::Build can properly handle these created
files:

  PL_files => {
               'lib/Foo/Bar.pm.PL' => 'lib/Foo/Bar.pm',
               'lib/something.PL'  => ['/lib/something', '/lib/else'],
               'lib/funny.PL'      => [],
              }

Here's an example of a simple PL file.

    my $output_file = shift;
    open my $fh, ">", $output_file or die "Can't open $output_file: $!";

    print $fh <<'END';
    #!/usr/bin/perl

    print "Hello, world!\n";
    END

PL files are not installed by default, so its safe to put them in
F<lib/> and F<bin/>.


=item pm_files

[version 0.19]

An optional parameter specifying the set of C<.pm> files in this
distribution, specified as a hash reference whose keys are the files'
locations in the distributions, and whose values are their logical
locations based on their package name, i.e. where they would be found
in a "normal" Module::Build-style distribution.  This parameter is
mainly intended to support alternative layouts of files.

For instance, if you have an old-style C<MakeMaker> distribution for a
module called C<Foo::Bar> and a F<Bar.pm> file at the top level of the
distribution, you could specify your layout in your C<Build.PL> like
this:

  my $build = Module::Build->new
    (
     module_name => 'Foo::Bar',
     ...
     pm_files => { 'Bar.pm' => 'lib/Foo/Bar.pm' },
    );

Note that the values should include C<lib/>, because this is where
they would be found in a "normal" Module::Build-style distribution.

Note also that the path specifications are I<always> given in
Unix-like format, not in the style of the local system.

=item pod_files

[version 0.19]

Just like C<pm_files>, but used for specifying the set of C<.pod>
files in your distribution.

=item recommends

[version 0.08]

This is just like the L</requires> argument, except that modules listed
in this section aren't essential, just a good idea.  We'll just print
a friendly warning if one of these modules aren't found, but we'll
continue running.

If a module is recommended but not required, all tests should still
pass if the module isn't installed.  This may mean that some tests
may be skipped if recommended dependencies aren't present.

Automated tools like CPAN.pm should inform the user when recommended
modules aren't installed, and it should offer to install them if it
wants to be helpful.

See the documentation for L<Module::Build::Authoring/"PREREQUISITES">
for the details of how requirements can be specified.

=item recursive_test_files

[version 0.28]

Normally, C<Module::Build> does not search subdirectories when looking
for tests to run. When this options is set it will search recursively
in all subdirectories of the standard 't' test directory.

=item release_status

[version 0.37]

The CPAN Meta Spec version 2 adds C<release_status> to allow authors
to specify how a distribution should be indexed.  Consistent with the
spec, this parameter can only have one three values: 'stable',
'testing' or 'unstable'.

Unless explicitly set by the author, C<release_status> will default
to 'stable' unless C<dist_version> contains an underscore, in which
case it will default to 'testing'.

It is an error to specify a C<release_status> of 'stable' when
C<dist_version> contains an underscore character.

=item requires

[version 0.07]

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN

module-level share files.

The simplest use of C<share_dir> is to set it to a directory name or an
arrayref of directory names containing files to be installed in the
distribution-level share directory.

  share_dir => 'share'

Alternatively, if C<share_dir> is a hashref, it may have C<dist> or
C<module> keys providing full flexibility in defining how share
directories should be installed.

  share_dir => {
    dist => [ 'examples', 'more_examples' ],
    module => {
      Foo::Templates => ['share/html', 'share/text'],
      Foo::Config    => 'share/config',
    }
  }

If C<share_dir> is set, then File::ShareDir will automatically be added
to the C<requires> hash.

=item sign

[version 0.16]

If a true value is specified for this parameter, L<Module::Signature>
will be used (via the 'distsign' action) to create a SIGNATURE file
for your distribution during the 'distdir' action, and to add the
SIGNATURE file to the MANIFEST (therefore, don't add it yourself).

The default value is false.  In the future, the default may change to
true if you have C<Module::Signature> installed on your system.

=item tap_harness_args

[version 0.2808_03]

An optional parameter specifying parameters to be passed to TAP::Harness when
running tests. Must be given as a hash reference of parameters; see the
L<TAP::Harness|TAP::Harness> documentation for details. Note that specifying
this parameter will implicitly set C<use_tap_harness> to a true value. You
must therefore be sure to add TAP::Harness as a requirement for your module in
L</build_requires>.

=item test_files

[version 0.23]

An optional parameter specifying a set of files that should be used as
C<Test::Harness>-style regression tests to be run during the C<test>
action.  May be given as an array reference of the files, or as a hash
reference whose keys are the files (and whose values will currently be
ignored).  If the argument is given as a single string (not in an
array reference), that string will be treated as a C<glob()> pattern
specifying the files to use.

The default is to look for a F<test.pl> script in the top-level
directory of the distribution, and any files matching the glob pattern
C<*.t> in the F<t/> subdirectory.  If the C<recursive_test_files>
property is true, then the C<t/> directory will be scanned recursively
for C<*.t> files.

=item use_tap_harness

[version 0.2808_03]

An optional parameter indicating whether or not to use TAP::Harness for
testing rather than Test::Harness. Defaults to false. If set to true, you must
therefore be sure to add TAP::Harness as a requirement for your module in
L</build_requires>. Implicitly set to a true value if C<tap_harness_args> is
specified.

=item xs_files

[version 0.19]

Just like C<pm_files>, but used for specifying the set of C<.xs>
files in your distribution.

=back


=item new_from_context(%args)

[version 0.28]

When called from a directory containing a F<Build.PL> script (in other words,
the base directory of a distribution), this method will run the F<Build.PL> and
call C<resume()> to return the resulting C<Module::Build> object to the caller.
Any key-value arguments given to C<new_from_context()> are essentially like
command line arguments given to the F<Build.PL> script, so for example you
could pass C<< verbose => 1 >> to this method to turn on verbosity.

=item resume()

[version 0.03]

You'll probably never call this method directly, it's only called from the
auto-generated C<Build> script (and the C<new_from_context> method).  The
C<new()> method is only called once, when the user runs C<perl Build.PL>.
Thereafter, when the user runs C<Build test> or another action, the
C<Module::Build> object is created using the C<resume()> method to
re-instantiate with the settings given earlier to C<new()>.

=item subclass()

[version 0.06]

This creates a new C<Module::Build> subclass on the fly, as described
in the L<Module::Build::Authoring/"SUBCLASSING"> section.  The caller
must provide either a C<class> or C<code> parameter, or both.  The
C<class> parameter indicates the name to use for the new subclass, and
defaults to C<MyModuleBuilder>.  The C<code> parameter specifies Perl
code to use as the body of the subclass.

=item add_property

[version 0.31]

  package 'My::Build';

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN

=over 4

=item add_build_element($type)

[version 0.26]

Adds a new type of entry to the build process.  Accepts a single
string specifying its type-name.  There must also be a method defined
to process things of that type, e.g. if you add a build element called
C<'foo'>, then you must also define a method called
C<process_foo_files()>.

See also
L<Module::Build::Cookbook/"Adding new file types to the build process">.

=item add_to_cleanup(@files)

[version 0.03]

You may call C<< $self->add_to_cleanup(@patterns) >> to tell
C<Module::Build> that certain files should be removed when the user
performs the C<Build clean> action.  The arguments to the method are
patterns suitable for passing to Perl's C<glob()> function, specified
in either Unix format or the current machine's native format.  It's
usually convenient to use Unix format when you hard-code the filenames
(e.g. in F<Build.PL>) and the native format when the names are
programmatically generated (e.g. in a testing script).

I decided to provide a dynamic method of the C<$build> object, rather
than just use a static list of files named in the F<Build.PL>, because
these static lists can get difficult to manage.  I usually prefer to
keep the responsibility for registering temporary files close to the
code that creates them.

=item args()

[version 0.26]

  my $args_href = $build->args;
  my %args = $build->args;
  my $arg_value = $build->args($key);
  $build->args($key, $value);

This method is the preferred interface for retrieving the arguments passed via
command line options to F<Build.PL> or F<Build>, minus the Module-Build
specific options.

When called in a scalar context with no arguments, this method returns a
reference to the hash storing all of the arguments; in an array context, it
returns the hash itself.  When passed a single argument, it returns the value
stored in the args hash for that option key.  When called with two arguments,
the second argument is assigned to the args hash under the key passed as the
first argument.

=item autosplit_file($from, $to)

[version 0.28]

Invokes the L<AutoSplit> module on the C<$from> file, sending the
output to the C<lib/auto> directory inside C<$to>.  C<$to> is
typically the C<blib/> directory.

=item base_dir()

[version 0.14]

Returns a string containing the root-level directory of this build,
i.e. where the C<Build.PL> script and the C<lib> directory can be
found.  This is usually the same as the current working directory,
because the C<Build> script will C<chdir()> into this directory as
soon as it begins execution.

=item build_requires()

[version 0.21]

Returns a hash reference indicating the C<build_requires>
prerequisites that were passed to the C<new()> method.

=item can_action( $action )

Returns a reference to the method that defines C<$action>, or false
otherwise. This is handy for actions defined (or maybe not!) in subclasses.

[version 0.32_xx]

=item cbuilder()

[version 0.2809]

Returns the internal ExtUtils::CBuilder object that can be used for
compiling & linking C code.  If no such object is available (e.g. if
the system has no compiler installed) an exception will be thrown.

=item check_installed_status($module, $version)

[version 0.11]

This method returns a hash reference indicating whether a version
dependency on a certain module is satisfied.  The C<$module> argument
is given as a string like C<"Data::Dumper"> or C<"perl">, and the
C<$version> argument can take any of the forms described in L</requires>
above.  This allows very fine-grained version checking.

The returned hash reference has the following structure:

  {
   ok => $whether_the_dependency_is_satisfied,
   have => $version_already_installed,
   need => $version_requested, # Same as incoming $version argument
   message => $informative_error_message,
  }

If no version of C<$module> is currently installed, the C<have> value
will be the string C<< "<none>" >>.  Otherwise the C<have> value will
simply be the version of the installed module.  Note that this means
that if C<$module> is installed but doesn't define a version number,
the C<have> value will be C<undef> - this is why we don't use C<undef>
for the case when C<$module> isn't installed at all.

This method may be called either as an object method

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN

module that can use a MySQL or PostgreSQL back-end, you might create
configuration variables called C<mysql_connect> and
C<postgres_connect>, and set each to an array of connection parameters
for C<< DBI->connect() >>.

Configuration values set in this way using the Module::Build object
will be available for querying during the build/test process and after
installation via the generated C<...::ConfigData> module, as
C<< ...::ConfigData->config($name) >>.

The L<feature()|/"feature($name)"> and C<config_data()> methods represent
Module::Build's main support for configuration of installed modules.
See also L<Module::Build::Authoring/"SAVING CONFIGURATION INFORMATION">.

=item conflicts()

[version 0.21]

Returns a hash reference indicating the C<conflicts> prerequisites
that were passed to the C<new()> method.

=item contains_pod($file) [deprecated]

[version 0.20]

[Deprecated] Please see L<Module::Metadata> instead.

Returns true if the given file appears to contain POD documentation.
Currently this checks whether the file has a line beginning with
'=pod', '=head', or '=item', but the exact semantics may change in the
future.

=item copy_if_modified(%parameters)

[version 0.19]

Takes the file in the C<from> parameter and copies it to the file in
the C<to> parameter, or the directory in the C<to_dir> parameter, if
the file has changed since it was last copied (or if it doesn't exist
in the new location).  By default the entire directory structure of
C<from> will be copied into C<to_dir>; an optional C<flatten>
parameter will copy into C<to_dir> without doing so.

Returns the path to the destination file, or C<undef> if nothing
needed to be copied.

Any directories that need to be created in order to perform the
copying will be automatically created.

The destination file is set to read-only. If the source file has the
executable bit set, then the destination file will be made executable.

=item create_build_script()

[version 0.05]

Creates an executable script called C<Build> in the current directory
that will be used to execute further user actions.  This script is
roughly analogous (in function, not in form) to the Makefile created
by C<ExtUtils::MakeMaker>.  This method also creates some temporary
data in a directory called C<_build/>.  Both of these will be removed
when the C<realclean> action is performed.

Among the files created in C<_build/> is a F<_build/prereqs> file
containing the set of prerequisites for this distribution, as a hash
of hashes.  This file may be C<eval()>-ed to obtain the authoritative
set of prerequisites, which might be different from the contents of
F<META.yml> (because F<Build.PL> might have set them dynamically).
But fancy developers take heed: do not put any fancy custom runtime
code in the F<_build/prereqs> file, leave it as a static declaration
containing only strings and numbers.  Similarly, do not alter the
structure of the internal C<< $self->{properties}{requires} >> (etc.)
data members, because that's where this data comes from.

=item current_action()

[version 0.28]

Returns the name of the currently-running action, such as "build" or
"test".  This action is not necessarily the action that was originally
invoked by the user.  For example, if the user invoked the "test"
action, current_action() would initially return "test".  However,
action "test" depends on action "code", so current_action() will
return "code" while that dependency is being executed.  Once that
action has completed, current_action() will again return "test".

If you need to know the name of the original action invoked by the
user, see L</invoked_action()> below.

=item depends_on(@actions)

[version 0.28]

Invokes the named action or list of actions in sequence.  Using this
method is preferred to calling the action explicitly because it
performs some internal record-keeping, and it ensures that the same
action is not invoked multiple times (note: in future versions of
Module::Build it's conceivable that this run-only-once mechanism will
be changed to something more intelligent).

Note that the name of this method is something of a misnomer; it
should really be called something like
C<invoke_actions_unless_already_invoked()> or something, but for
better or worse (perhaps better!) we were still thinking in
C<make>-like dependency terms when we created this method.

See also L<dispatch()|/"dispatch($action, %args)">.  The main
distinction between the two is that C<depends_on()> is meant to call
an action from inside another action, whereas C<dispatch()> is meant
to set the very top action in motion.

=item dir_contains($first_dir, $second_dir)

[version 0.28]

Returns true if the first directory logically contains the second
directory.  This is just a convenience function because C<File::Spec>
doesn't really provide an easy way to figure this out (but
C<Path::Class> does...).

=item dispatch($action, %args)

[version 0.03]

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN

Set or retrieve the relative paths that are appended to
C<install_base> for any installable element. This is useful if you
want to set the relative install path for custom build elements.

With no argument, it returns a reference to a hash containing all
elements and their respective values. This hash should not be modified
directly; use the multiple argument below form to change values.

The single argument form returns the value associated with the
element C<$type>.

The multiple argument form allows you to set the paths for element types.
C<$value> must be a relative path using Unix-like paths.  (A series of
directories separated by slashes, e.g. C<foo/bar>.)  The return value is a
localized path based on C<$value>.

Assigning the value C<undef> to an element causes it to be removed.

=item install_destination($type)

[version 0.28]

Returns the directory in which items of type C<$type> (e.g. C<lib>,
C<arch>, C<bin>, or anything else returned by the L</install_types()>
method) will be installed during the C<install> action.  Any settings
for C<install_path>, C<install_base>, and C<prefix> are taken into
account when determining the return value.

=item install_path()

=item install_path($type)

=item install_path($type => $path)

[version 0.28]

Set or retrieve paths for specific installable elements. This is
useful when you want to examine any explicit install paths specified
by the user on the command line, or if you want to set the install
path for a specific installable element based on another attribute
like C<install_base()>.

With no argument, it returns a reference to a hash containing all
elements and their respective values. This hash should not be modified
directly; use the multiple argument below form to change values.

The single argument form returns the value associated with the
element C<$type>.

The multiple argument form allows you to set the paths for element types.
The supplied C<$path> should be an absolute path to install elements
of C<$type>.  The return value is C<$path>.

Assigning the value C<undef> to an element causes it to be removed.

=item install_types()

[version 0.28]

Returns a list of installable types that this build knows about.
These types each correspond to the name of a directory in F<blib/>,
and the list usually includes items such as C<lib>, C<arch>, C<bin>,
C<script>, C<libdoc>, C<bindoc>, and if HTML documentation is to be
built, C<libhtml> and C<binhtml>.  Other user-defined types may also
exist.

=item invoked_action()

[version 0.28]

This is the name of the original action invoked by the user.  This
value is set when the user invokes F<Build.PL>, the F<Build> script,
or programmatically through the L<dispatch()|/"dispatch($action, %args)">
method.  It does not change as sub-actions are executed as
dependencies are evaluated.

To get the name of the currently executing dependency, see
L</current_action()> above.

=item notes()

=item notes($key)

=item notes($key => $value)

[version 0.20]

The C<notes()> value allows you to store your own persistent
information about the build, and to share that information among
different entities involved in the build.  See the example in the
C<current()> method.

The C<notes()> method is essentially a glorified hash access.  With no
arguments, C<notes()> returns the entire hash of notes.  With one argument,
C<notes($key)> returns the value associated with the given key.  With two
arguments, C<notes($key, $value)> sets the value associated with the given key
to C<$value> and returns the new value.

The lifetime of the C<notes> data is for "a build" - that is, the
C<notes> hash is created when C<perl Build.PL> is run (or when the
C<new()> method is run, if the Module::Build Perl API is being used
instead of called from a shell), and lasts until C<perl Build.PL> is
run again or the C<clean> action is run.

=item orig_dir()

[version 0.28]

Returns a string containing the working directory that was in effect
before the F<Build> script chdir()-ed into the C<base_dir>.  This
might be useful for writing wrapper tools that might need to chdir()
back out.

=item os_type()

[version 0.04]

If you're subclassing Module::Build and some code needs to alter its
behavior based on the current platform, you may only need to know
whether you're running on Windows, Unix, MacOS, VMS, etc., and not the
fine-grained value of Perl's C<$^O> variable.  The C<os_type()> method

local/lib/perl5/Module/Build/API.pod view on Meta::CPAN

references to hashes of module names and version numbers.  Only prerequisites
types that are defined will be included.  The C<prereq_data> action is just a
thin wrapper around the C<prereq_data()> method and dumps the hash as a string
that can be loaded using C<eval()>.

=item prereq_report()

[version 0.28]

Returns a human-readable (table-form) string showing 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.  The C<prereq_report> action is just a thin wrapper around the
C<prereq_report()> method.

=item prompt($message, $default)

[version 0.12]

Asks the user a question and returns their response as a string.  The
first argument specifies the message to display to the user (for
example, C<"Where do you keep your money?">).  The second argument,
which is optional, specifies a default answer (for example,
C<"wallet">).  The user will be asked the question once.

If C<prompt()> detects that it is not running interactively and there
is nothing on STDIN or if the PERL_MM_USE_DEFAULT environment variable
is set to true, the $default will be used without prompting.

To prevent automated processes from blocking, the user must either set
PERL_MM_USE_DEFAULT or attach something to STDIN (this can be a
pipe/file containing a scripted set of answers or /dev/null.)

If no $default is provided an empty string will be used instead.  In
non-interactive mode, the absence of $default is an error (though
explicitly passing C<undef()> as the default is valid as of 0.27.)

This method may be called as a class or object method.

=item recommends()

[version 0.21]

Returns a hash reference indicating the C<recommends> prerequisites
that were passed to the C<new()> method.

=item requires()

[version 0.21]

Returns a hash reference indicating the C<requires> prerequisites that
were passed to the C<new()> method.

=item rscan_dir($dir, $pattern)

[version 0.28]

Uses C<File::Find> to traverse the directory C<$dir>, returning a
reference to an array of entries matching C<$pattern>.  C<$pattern>
may either be a regular expression (using C<qr//> or just a plain
string), or a reference to a subroutine that will return true for
wanted entries.  If C<$pattern> is not given, all entries will be
returned.

Examples:

 # All the *.pm files in lib/
 $m->rscan_dir('lib', qr/\.pm$/)

 # All the files in blib/ that aren't *.html files
 $m->rscan_dir('blib', sub {-f $_ and not /\.html$/});

 # All the files in t/
 $m->rscan_dir('t');

=item runtime_params()

=item runtime_params($key)

[version 0.28]

The C<runtime_params()> method stores the values passed on the command line
for valid properties (that is, any command line options for which
C<valid_property()> returns a true value).  The value on the command line may
override the default value for a property, as well as any value specified in a
call to C<new()>.  This allows you to programmatically tell if C<perl Build.PL>
or any execution of C<./Build> had command line options specified that
override valid properties.

The C<runtime_params()> method is essentially a glorified read-only hash.  With
no arguments, C<runtime_params()> returns the entire hash of properties
specified on the command line.  With one argument, C<runtime_params($key)>
returns the value associated with the given key.

The lifetime of the C<runtime_params> data is for "a build" - that is, the
C<runtime_params> hash is created when C<perl Build.PL> is run (or when the
C<new()> method is called, if the Module::Build Perl API is being used instead
of called from a shell), and lasts until C<perl Build.PL> is run again or the
C<clean> action is run.

=item script_files()

[version 0.18]

Returns a hash reference whose keys are the perl script files to be
installed, if any.  This corresponds to the C<script_files> parameter to the
C<new()> method.  With an optional argument, this parameter may be set
dynamically.

For backward compatibility, the C<scripts()> method does exactly the
same thing as C<script_files()>.  C<scripts()> is deprecated, but it
will stay around for several versions to give people time to
transition.

=item up_to_date($source_file, $derived_file)

=item up_to_date(\@source_files, \@derived_files)

[version 0.20]

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