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=head4 --exists
Return success (0) if the package exists in the search path.
=head4 --with-path=PATH
Prepend C<PATH> to the list of search paths containing C<.pc> files.
This option can be specified multiple times with different paths, and they will
all be added.
=head4 --env-only
Using this option, B<only> paths specified in C<PKG_CONFIG_PATH> are recognized
and any hard-coded defaults are ignored.
=head4 --guess-paths
Invoke C<gcc> and C<ld> to determine default linker and include paths. Default
paths will be excluded from explicit -L and -I flags.
=head4 --define-variable=VARIABLE=VALUE
Define a variable, overriding any such variable definition in the .pc file, and
allowing your value to interpolate with subsequent uses.
=head4 --variable=VARIABLE
This returns the value of a variable defined in a package's .pc file.
=head4 --print-variables
Print all defined variables found in the .pc files.
=head4 --version
The target version of C<pkg-config> emulated by this script
=head4 --real-version
The actual version of this script
=head4 --debug
Print debugging information
=head4 --silence-errors
Turn off errors. This is the default for non-libs/cflag/modversion
arguments
=head4 --print-errors
Print errors to STDERR and takes precedence over
C<--silence-errors>
=head4 --short-errors
Ignored, but recognized for compatibility.
=head4 --errors-to-stdout
Print errors to STDOUT and takes precedence over
C<--print-errors>
=head3 ENVIRONMENT
the C<PKG_CONFIG_PATH> and C<PKG_CONFIG_LIBDIR> variables are honored and used
as a colon-delimited (semicolon-delimited on Windows) list of directories with
contain C<.pc> files.
Other environment variables recongized by both C<pkg-config> and L<PkgConfig>
include:
=over 4
=item PKG_CONFIG_ALLOW_SYSTEM_CFLAGS
=item PKG_CONFIG_ALLOW_SYSTEM_LIBS
=back
If L<Win32API::Registry> is installed, on Windows (but not Cygwin) L<PkgConfig>
will also consult these registry keys. The names are ignored, but the values
are paths containing C<.pc> files.
=over 4
=item HKEY_CURRENT_USER\Software\pkgconfig\PKG_CONFIG_PATH
=item HKEY_LOCAL_MACHINE\Software\pkgconfig\PKG_CONFIG_PATH
=back
Registry support should be considered somewhat experimental, subject to change
in the future, though not without good reason. The rationale for this caveat
is that this feature is documented in several places, but I have yet to find
a working version that implements this feature.
=head2 MODULE OPTIONS