Hi Jan.

It compiles now, with this recipe:

;install:
gcc-objc
gnustep-make 2.6.6-1
gnustep-base 1.24.6-1
gnustep-gui 0.24.0-2

;configure with
 $ CFLAGS='-g -O2 -DGNUSTEP' ./configure --with-ns --with-gnustep-conf=/etc/GNUstep/GNUstep.conf

; when problem linking -lobjc
 $ sudo ln -s /usr/lib/libobjc.so.4.0.0 /usr/lib/libobjc.so

That is for compilation.

Now the problem when running it
font rendering problem(also when maximizing frame the rendering of the buffer takes a long time):
$ emacs -Q --eval "(calendar)"

see pic: