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=item F<$HOME/.ActivePerl/$VERSION/ppm-$ARCH.db>
SQLite database where ppm keeps its configuration and caches meta
information about the content of the enabled repositories.
=item F<$HOME/.ActivePerl/ppm4.log>
Log file created to record actions that PPM takes. On Windows this is
logged to F<$TEMPDIR/ppm4.log>.
On Mac OS X this is logged to F<$HOME/Library/Logs/ppm4.log>.
=item F<$PREFIX/etc/ppm-$NAME-area.db>
SQLite database where PPM tracks packages installed in the install area
under C<$PREFIX>.
=item F<$TEMPDIR/ppm-XXXXXX/>
Temporary directories used during install. Packages to be installed
are unpacked here.
=item F<*.ppmx>
These files contains a single package that can be installed by PPM.
They are compressed tarballs containing the PPD file for the package
and the F<blib> tree to be installed.
=item F<*.ppd>
XML files containing meta information about packages. Each package has
its own .ppd file. See L<ActivePerl::PPM::PPD> for additional
information.
=item F<package.xml>
Meta information about repositories. When a repository is added, PPM
looks for this file and if present, monitors it too stay in sync with
the state of the repository.
=item F<package.lst>
Same as F<package.xml> but PPM 3 compatible. PPM will use this file
if F<package.xml> is not available.
=back
=head1 ENVIRONMENT
The following environment variables affect how PPM behaves:
=over
=item C<ACTIVEPERL_PPM_DEBUG>
If set to a TRUE value, makes PPM print more internal diagnostics.
=item C<ACTIVEPERL_PPM_BOX_CHARS>
Select what kind of box drawing characters to use for the C<ppm *
list> outputs. Valid values are C<ascii>, C<dos> and C<unicode>. The
default varies.
=item C<ACTIVEPERL_PPM_HOME>
If set, use this directory to store state and configuration
information for PPM. This defaults to
F<$LOCAL_APPDATA/ActiveState/ActivePerl/$VERSION> on Windows and
F<$HOME/.ActivePerl/$VERSION/> on Unix systems.
=item C<ACTIVEPERL_PPM_LOG_CONS>
If set to a TRUE value, make PPM print any log output to the console as
well.
=item C<DBI_TRACE>
PPM uses L<DBI> to access the internal SQLite databases. Setting
DBI_TRACE allow you to see what queries are performed. Output goes to
STDERR. See L<DBI> for further details.
=item C<http_proxy>
PPM uses L<LWP> to access remote repositories. If you need HTTP
traffic pass via a proxy server to reach the repository, you must set
the C<http_proxy> environment variable. Some examples:
Using bash:
export http_proxy=http://proxy.mycompany.com
Using cmd.exe:
set http_proxy=http://username:password@proxy.mycompany.com:8008
See L<LWP::UserAgent/env_proxy> for more.
=back
=head1 WHAT'S NEW IN VERSION 4