Each of these packages needs to be built and installed on your Linux system in order to gain access to the full power of Objective-C and to be able to work with the examples in the remainder of this book. Fortunately a single package called ''GNUstep Startup'' is provided that contains the source code for all four of the above packages. This package can be downloaded from the [http://wwwmain.gnustep.org/resources/downloads.php?site=ftp%3A%2F%2Fftp.gnustep.org%2Fpub%2Fgnustep%2F#core GNUstep.org website download page]. be Be sure to download the latest ''stable'' release of the ''GNUstep StarterStartup'' software.
Once the package has been download to a suitable work folder it can be unpacked as follows (where <version> is replaced by the version number of the package you downloaded):