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Eval::LineNumbers adds a #line "this-file" 392 comment to hereis text that is going to be eval'd so that error messages will point back to the right place. Please note: when you embed \n in your code, it gets expanded in double-quote hereis documents so it will mess up your line numbering. Use \\n instead when you can.

The pkg-config program retrieves information about installed libraries, usually for the purposes of compiling against and linking to them. ExtUtils::PkgConfig is a very simplistic interface to this utility, intended for use in the Makefile.PL of perl extensions which bind libraries that pkg-config knows. It is really just boilerplate code that you would've written yourself.

Exporter::Declare is a meta-driven exporting tool. Exporter::Declare tries to adopt all the good features of other exporting tools, while throwing away horrible interfaces. Exporter::Declare also provides hooks that allow you to add options and arguments for import. Finally, Exporter::Declare's meta-driven system allows for top-notch introspection.

XS++ is just a thin layer over plain XS, hence to use it you are supposed to know, at the very least, C++ and XS. This means that you will need typemaps for both the normal XS pre-processor xsubpp and the XS++ pre-processor xspp.

File::PathConvert provides functions to convert between absolute and relative paths, and from logical paths to physical paths on a variety of filesystems, including the URL 'filesystem'. For new programs, it is probably better to use File::Spec and Cwd modules, if you can help it.

File::DirSync will make two directories exactly the same. The goal is to perform this synchronization process as quickly as possible with as few stats and reads and writes as possible. It usually can perform the synchronization process within a few milliseconds - even for gigabytes or more of information.

File::Tempdir is a Perl5 module which provides an object interface to tempdir() from File::Temp. This allow to destroy the temporary directory as soon you don't need it anymore using the magic DESTROY() function automatically call be perl when the object is no longer reference.

File::Util provides a comprehensive toolbox of utilities to automate all kinds of common tasks on file / directories. Its purpose is to do so in the most portable manner possible so that users of this module won't have to worry about whether their programs will work on other OSes and machines.

File::Write::Rotate can be used to write to file, usually for logging, that can rotate itself. File will be opened in append mode. Locking will be done to avoid conflict when there are multiple writers. Rotation can be done by size (after a certain size is reached), by time (daily/monthly/yearly), or both.

Filter::Template is a Perl source filter that provides simple inline source code templates. Inlined source code can be significantly faster than subroutines, especially for small-scale functions like accessors and mutators. On the other hand, they are more difficult to maintain and use. Choose your trade-offs wisely.