helper to build Perl program using SDL libraries

 Perl's idea of a metapackage to provide C library dependencies for
 Perl SDL application.
 .
 When building from source, this package can be used to detect and get
 configuration settings from an installed SDL and related libraries. As
 a binary package, it provides a record of all native libs used when
 building this package. This record is queried by other Perl SDL
 application to know what native libraries are available. In order to
 actually provide these libraries, libalien-sdl-perl package will
 depend on a lot of lib packages (like libsdl-image1.2) even though it
 does not uses them directly.
 .
 Regarding the native C libraries, all packages built with
 libalien-sdl-perl must have at least the same build dependencies than
 libalien-sdl-perl. Since this list if not fun to maintain, this
 metapackage depends on all packages used to build libalien-sdl-perl
 (and on libalien-sdl-perl).