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      Regular expression for the files that should be copied from the
      DESTDIR into the stage directory. If not defined, then all files will
      be copied.

    destdir_ffi_filter

      Same as destdir_filter except applies to build_ffi instead of build.

    digest

      This properties contains the cryptographic digests (if any) that
      should be used when verifying any fetched and downloaded files. It is
      a hash reference where the key is the filename and the value is an
      array reference containing a pair of values, the first being the
      algorithm ('SHA256' is recommended) and the second is the actual
      digest. The special filename * may be specified to indicate that any
      downloaded file should match that digest. If there are both real
      filenames and the * placeholder, the real filenames will be used for
      filenames that match and any other files will use the placeholder.
      Example:

       $build->meta_prop->{digest} = {
         'foo-1.00.tar.gz' => [ SHA256 => '9feac593aa49a44eb837de52513a57736457f1ea70078346c60f0bfc5f24f2c1' ],
         'foo-1.01.tar.gz' => [ SHA256 => '6bbde6a7f10ae5924cf74afc26ff5b7bc4b4f9dfd85c6b534c51bd254697b9e7' ],
         '*'               => [ SHA256 => '33a20aae3df6ecfbe812b48082926d55391be4a57d858d35753ab1334b9fddb3' ],
       };

      Cryptographic signatures will only be checked if the check_digest
      meta property is set and if the Digest negotiator plugin is loaded.
      (The Digest negotiator can be used directly, but is also loaded
      automatically if you use the digest directive is used by the
      alienfile).

    env

      Environment variables to override during the build stage.

    env_interpolate

      Environment variable values will be interpolated with helpers.
      Example:

       meta->prop->{env_interpolate} = 1;
       meta->prop->{env}->{PERL} = '%{perl}';

    local_source

      Set to true if source code package is available locally. (that is not
      fetched over the internet). This is computed by default based on the
      start_url property. Can be set by an alienfile or plugin.

    platform

      Hash reference. Contains information about the platform beyond just
      $^O.

      platform.compiler_type

	Refers to the type of flags that the compiler accepts. May be
	expanded in the future, but for now, will be one of:

	microsoft

	  On Windows when using Microsoft Visual C++

	unix

	  Virtually everything else, including gcc on windows.

	The main difference is that with Visual C++ -LIBPATH should be used
	instead of -L, and static libraries should have the .LIB suffix
	instead of .a.

      platform.system_type

	$^O is frequently good enough to make platform specific logic in
	your alienfile, this handles the case when $^O can cover platforms
	that provide multiple environments that Perl might run under. The
	main example is windows, but others may be added in the future.

	unix

	vms

	windows-activestate

	windows-microsoft

	windows-mingw

	windows-strawberry

	windows-unknown

	Note that cygwin and msys are considered unix even though they run
	on windows!

      platform.cpu.count

	Contains a non-negative integer of available (possibly virtual)
	CPUs on the system. This can be used by build plugins to build in
	parallel. The environment variable ALIEN_CPU_COUNT can be set to
	override the CPU count.

      platform.cpu.arch.name

	Contains a normalized name for the architecture of the current
	Perl. This can be used by fetch plugins to determine which binary
	packages to download. The value may be one of the following, but
	this list will be expanded as needed.

	armel

	  32-bit ARM soft-float

	armhf

	  32-bit ARM hard-float

	aarch64

	  64-bit ARM

	ppc

	  32-bit PowerPC (big-endian)

	ppc64

	  64-bit PowerPC (big-endian)

	x86

	  32-bit Intel (i386, i486, i686)

	x86_64

	  64-bit Intel (AMD64)

	unknown

	  Unable to detect architecture. Please report this if needed.

    out_of_source

      Build in a different directory from the where the source code is
      stored. In autoconf this is referred to as a "VPATH" build. Everyone
      else calls this an "out-of-source" build. When this property is true,
      instead of extracting to the source build root, the downloaded source
      will be extracted to an source extraction directory and the source
      build root will be empty. You can use the extract install property to
      get the location of the extracted source.

    network

      True if a network fetch is available. This should NOT be set by an
      alienfile or plugin. This is computed based on the
      ALIEN_INSTALL_NETWORK environment variables.

    start_url

      The default or start URL used by fetch plugins.

 install_prop

     my $href = $build->install_prop;

    Install properties are used during the install phase (either under
    share or system install). They are remembered for the entire install
    phase, but not kept around during the runtime phase. Thus they cannot