[...]

No conditional flags passed
from available:
--with   :	 tests
--without:	 kerberos5
Available branches: master
--2016-03-24 09:17:02--  http://distfiles.pld-linux.org/distfiles/by-md5/2/e/2e4efe57ff28cb3202a112e90f0c2889/serf-1.3.8.tar.bz2
Resolving distfiles.pld-linux.org (distfiles.pld-linux.org)... 193.239.45.41
Connecting to distfiles.pld-linux.org (distfiles.pld-linux.org)|193.239.45.41|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 143337 (140K) [application/x-bzip2]
Saving to: 'serf-1.3.8.tar.bz2'
     0K .......... .......... .......... .......... .......... 35%  900K 0s
    50K .......... .......... .......... .......... .......... 71% 1.70M 0s
   100K .......... .......... .......... .........            100% 1.46M=0.1s
2016-03-24 09:17:02 (1.23 MB/s) - 'serf-1.3.8.tar.bz2' saved [143337/143337]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/serf-1.3.8-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 7829d15... - x32 rebuild - release 2 (by relup.sh)
fatal: HEAD does not point to a branch
No conditional flags passed
from available:
--with   :	 tests
--without:	 kerberos5
Writing git revision for tag auto/ti/serf-1.3.8-2
On detached HEAD. Use -r BRANCHNAME to override
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean): env -i TMP=/home/users/builder/tmp HOME=/home/users/builder PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.61155
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf serf-1.3.8
Begin-PLD-Builder-Info
Build-Time: user:2.66s sys:1.34s real:8.64s (faults io:155 non-io:213807)
Files queued for ftp:
    150122 serf-1.3.8-2.src.rpm
       182 serf-1.3.8-2.src.rpm.uploadinfo
End-PLD-Builder-Info