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 system "$patch -p1 < foo.patch";

Or in your L<alienfile>:

 use alienfile;
 ...
 share {
    ...
    # Alien-Build knows to automatically pull in Alien::patch
    # so you do not need to specify it as a prereq.
    # The %{.install.patch} directory is a shortcut for the
    # `patch' directory in your dist, and gets copied into the
    # dist share directory, so you can rebuild with `af' after
    # install.
    patch [ '%{patch} -p1 < %{.install.patch}/mypatch.patch' ];
 };

Or with L<Alien::Build::ModuleBuild>:

 use Alien::Base::ModuleBuild;
 Alien::Base::ModuleBuild->new(
   ...
   alien_bin_requires => {
     'Alien::patch' => '0.08',
   },
   alien_build_commands => {
     '%{patch} -p1 < foo.patch',
   },
   ...
 )->create_build_script;

=head1 DESCRIPTION

Many environments provide the patch command, but a few do not.
Using this module in your L<alienfile> (or elsewhere) you can
make sure that patch will be available.  If the system provides
it, then great, this module is a no-op.  If it does not, then
it will download and install it into a private location so that
it can be added to the C<PATH> when this module is used.

This class is a subclass of L<Alien::Base>, and works closely
with L<Alien::Build> and L<alienfile>

=head1 METHODS

=head2 exe

 my $exe = Alien::patch->exe;

Returns the command to run patch on your system.  For now it simply
adds the C<--binary> option on Windows (C<MSWin32> but not C<cygwin>)
which is usually what you want.

=head1 HELPERS

=head2 patch

 %{patch}

When used with L<Alien::Base::ModuleBuild> in a C<alien_build_commands> or C<alien_install_commands>,
this helper will be replaced by either C<patch> (Unix and cygwin) or C<patch --binary> (MSWin32).

=head1 SEE ALSO

=over 4

=item L<Alien>

=item L<Alien::Build>

=item L<alienfile>

=back

1;

=head1 AUTHOR

Author: Graham Ollis E<lt>plicease@cpan.orgE<gt>

Contributors:

Zakariyya Mughal

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2017 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut