[...]

fatal: HEAD does not point to a branch
No conditional flags passed
from available:
--with   :	
--without:	 tests
Available branches: master
--2015-03-11 09:04:53--  http://distfiles.pld-linux.org/distfiles/by-md5/3/b/3bbce5667ef6b6914231054e50c56001/XML-TreeBuilder-5.2.tar.gz
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: 11970 (12K) [application/x-gzip]
Saving to: 'XML-TreeBuilder-5.2.tar.gz'
     0K .......... .                                          100% 15.4M=0.001s
2015-03-11 09:04:53 (15.4 MB/s) - 'XML-TreeBuilder-5.2.tar.gz' saved [11970/11970]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/perl-XML-TreeBuilder-5.2-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 5f5adc5... - updated to 5.2
fatal: HEAD does not point to a branch
No conditional flags passed
from available:
--with   :	
--without:	 tests
Writing git revision for tag auto/ti/perl-XML-TreeBuilder-5.2-1
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.21058
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf XML-TreeBuilder-5.2
Begin-PLD-Builder-Info
Build-Time: user:2.53s sys:0.98s real:4.09s (faults io:0 non-io:151673)
Files queued for ftp:
     17615 perl-XML-TreeBuilder-5.2-1.src.rpm
       196 perl-XML-TreeBuilder-5.2-1.src.rpm.uploadinfo
End-PLD-Builder-Info