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   /([\$*])(([\w\:\']*)\bVERSION)\b.*\=/

eval()-ing that line, then checking the value of the C<$VERSION>
variable.  Quite ugly, really, but all the modules on CPAN depend on
this process, so there's no real opportunity to change to something
better.

If the target file of L</dist_version_from> contains more than one package
declaration, the version returned will be the one matching the configured
L</module_name>.

=item dynamic_config

[version 0.07]

A boolean flag indicating whether the F<Build.PL> file must be
executed, or whether this module can be built, tested and installed
solely from consulting its metadata file.  The main reason to set this
to a true value is that your module performs some dynamic
configuration as part of its build/install process.  If the flag is
omitted, the F<META.yml> spec says that installation tools should
treat it as 1 (true), because this is a safer way to behave.

Currently C<Module::Build> doesn't actually do anything with this flag
- it's up to higher-level tools like C<CPAN.pm> to do something useful
with it.  It can potentially bring lots of security, packaging, and
convenience improvements.

=item extra_compiler_flags

=item extra_linker_flags

[version 0.19]

These parameters can contain array references (or strings, in which
case they will be split into arrays) to pass through to the compiler
and linker phases when compiling/linking C code.  For example, to tell
the compiler that your code is C++, you might do:

  my $build = Module::Build->new
    (
     module_name          => 'Foo::Bar',
     extra_compiler_flags => ['-x', 'c++'],
    );

To link your XS code against glib you might write something like:

  my $build = Module::Build->new
    (
     module_name          => 'Foo::Bar',
     dynamic_config       => 1,
     extra_compiler_flags => scalar `glib-config --cflags`,
     extra_linker_flags   => scalar `glib-config --libs`,
    );

=item extra_manify_args

[version 0.4006]

Any extra arguments to pass to C<< Pod::Man->new() >> when building
man pages.  One common choice might be C<< utf8 => 1 >> to get Unicode
support.

=item get_options

[version 0.26]

You can pass arbitrary command line options to F<Build.PL> or
F<Build>, and they will be stored in the Module::Build object and can
be accessed via the L</args()> method.  However, sometimes you want
more flexibility out of your argument processing than this allows.  In
such cases, use the C<get_options> parameter to pass in a hash
reference of argument specifications, and the list of arguments to
F<Build.PL> or F<Build> will be processed according to those
specifications before they're passed on to C<Module::Build>'s own
argument processing.

The supported option specification hash keys are:


=over 4

=item type

The type of option.  The types are those supported by Getopt::Long; consult
its documentation for a complete list.  Typical types are C<=s> for strings,
C<+> for additive options, and C<!> for negatable options.  If the
type is not specified, it will be considered a boolean, i.e. no
argument is taken and a value of 1 will be assigned when the option is
encountered.

=item store

A reference to a scalar in which to store the value passed to the option.
If not specified, the value will be stored under the option name in the
hash returned by the C<args()> method.

=item default

A default value for the option.  If no default value is specified and no option
is passed, then the option key will not exist in the hash returned by
C<args()>.

=back


You can combine references to your own variables or subroutines with
unreferenced specifications, for which the result will also be stored in the
hash returned by C<args()>.  For example:

  my $loud = 0;
  my $build = Module::Build->new
    (
     module_name => 'Foo::Bar',
     get_options => {
                     Loud =>     { store => \$loud },
                     Dbd  =>     { type  => '=s'   },
                     Quantity => { type  => '+'    },
                    }
    );