[...]

./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-2.3.21-1.1.src.rpm
real 0.35
user 0.33
sys 0.01
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-2.3.21.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-2.3.21-1.1.src.rpm
real 0.35
user 0.33
sys 0.02
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-2.3.21-1.1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.54s sys:0.55s real:3.33s (faults io:12 non-io:233708)
Files queued for ftp:
   7786964 dovecot-2.3.21-1.1.src.rpm
       188 dovecot-2.3.21-1.1.src.rpm.uploadinfo
End-TLD-Builder-Info