[...]

./builder[2756]: ulimit: exceeds allowable limit
warning: line 68: It's not recommended to have unversioned Obsoletes: Obsoletes:	heimdal-daemons
warning: Macro expanded in comment on line 378: %{_libdir}/dovecot, ldconfig does not look into this
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/dovecot-2.3.18-2.src.rpm
real 0.65
user 0.58
sys 0.07
exit status 0
Writing package revision
builder: SMP make flags are set to -j2
Already up to date.
warning: line 68: It's not recommended to have unversioned Obsoletes: Obsoletes:	heimdal-daemons
warning: Macro expanded in comment on line 378: %{_libdir}/dovecot, ldconfig does not look into this
No conditional flags passed
from available:
--with   :	
--without:	 gssapi ldap mysql pgsql sasl sqlite tests
Available branches: dovecot-2.2 master
dovecot-2.3.18.tar.gz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: line 68: It's not recommended to have unversioned Obsoletes: Obsoletes:	heimdal-daemons
warning: Macro expanded in comment on line 378: %{_libdir}/dovecot, ldconfig does not look into this
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/dovecot-2.3.18-2.src.rpm
real 0.65
user 0.57
sys 0.07
warning: line 68: It's not recommended to have unversioned Obsoletes: Obsoletes:	heimdal-daemons
warning: Macro expanded in comment on line 378: %{_libdir}/dovecot, ldconfig does not look into this
Writing git revision for tag tld/dovecot-2.3.18-2
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:2.80s sys:1.64s real:4.25s (faults io:22 non-io:225964)
Files queued for ftp:
   7712691 dovecot-2.3.18-2.src.rpm
       186 dovecot-2.3.18-2.src.rpm.uploadinfo
End-TLD-Builder-Info