This was originally reported by an openchange user, but I reproduced it locally on a new Kubuntu 11.10 VM.

[ 595/3746] Compiling lib/util/charset/charcnv.c
In file included from ../libcli/smb/smb_common.h:31:0,
                 from ../lib/util/charset/charcnv.c:25:
../libcli/smb/smb_seal.h:24:27: fatal error: gssapi/gssapi.h: No such file or directory
compilation terminated.
Waf: Leaving directory `/home/bradh/openchange.trunk/samba4/bin'
Build failed:  -> task failed (err #1): 
        {task: cc charcnv.c -> charcnv_2.o}                                                                                                                                                                
make: *** [all] Error 1
Error in samba4 make (error code 2)

It looks like something is going wrong with the configure checks. Installing the krb5-dev package is enough to get the build completed.