In the recent repo clean up operation gnustep-back was dropped to AUR.
I have maintained the oolite package when it was still in AUR and
remember plenty of problems with running oolite against faulty /
incomplete gnustep-core implementations .
The gnustep upstream website [1] lists gnustep-back as a required
package for every gnustep install .
The ANNOUNCE file in gnustep-back source code [2] states gnustep-gui &
gnustep-back are 2 components of the display system used by gnustep .
I feel that removing gnustep-back from gnustep-core group goes against
arch linux policy of staying as close to upstream as possible.
Lone_Wolf
[1]
http://wwwmain.gnustep.org/resources/downloads.php?site=ftp%3A%2F%2Fftp.gnustep.org%2Fpub%2Fgnustep%2F#core
[2] ftp://ftp.gnustep.org/pub/gnustep/core/gnustep-back-0.25.1.tar.gz