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.\" ========================================================================
.\"
.IX Title "Module::Install::AuthorRequires 3pm"
.TH Module::Install::AuthorRequires 3pm "2009-07-14" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Module::Install::AuthorRequires \- declare author\-only dependencies
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    author_requires \*(AqSome::Module\*(Aq;
\&    author_requires \*(AqAnother::Module\*(Aq => \*(Aq0.42\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Modules often have optional requirements, for example dependencies that are
useful for (optional) tests, but not required for the module to work properly.
.PP
Usually you want all developers of a project to have these optional modules
installed. However, simply telling everyone or printing diagnostic messages if
optional dependencies are missing often isn't enough to make sure all authors
have all optional modules installed.
.PP
\&\f(CW\*(C`Module::Install\*(C'\fR already has a way of detecting an author environment, so an
easy way to achieve the above would be something like:
.PP
.Vb 4
\&    if ($Module::Install::AUTHOR) {
\&        requires \*(AqSome::Module\*(Aq;
\&        requires \*(AqAnother::Module\*(Aq => \*(Aq0.42\*(Aq;
\&    }
.Ve
.PP
Unfortunately, that'll also make the optional dependencies show up in the
distributions \f(CW\*(C`META.yml\*(C'\fR file, which is obviously wrong, as they aren't
actually hard requirements.
.PP
Working that around requires a considerable amount of non-trivial Makefile.PL
hackery, or simply using this module's \f(CW\*(C`author_requires\*(C'\fR command.
.SH "COMMANDS"
.IX Header "COMMANDS"
.SS "author_requires"
.IX Subsection "author_requires"
.Vb 2
\&    author_requires $module;
\&    author_requires $module => $version;
.Ve
.PP
This declares a hard dependency, that's only enforced in author environments
and is not put in the generate \f(CW\*(C`META.yml\*(C'\fR file of the distribution.
.SH "AUTHOR"
.IX Header "AUTHOR"
Florian Ragwitz <rafl@debian.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2009  Florian Ragwitz
.PP
This is free software; you can redistribute it and/or modify it under the same
terms as the Perl 5 programming language system itself.