[...]

No conditional flags passed
from available:
--with   :	
--without:	 tests
Available branches: AC-branch master
Searching for tag auto/ti/perl-XML-SAX-Expat-0.51-1...
Searching for tag auto/ti/perl-XML-SAX-Expat-0_51-1...
--2017-04-13 07:30:47--  http://distfiles.pld-linux.org/distfiles/by-md5/7/4/74c540095d84e3f054d1f8703a73ef76/XML-SAX-Expat-0.51.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: 7134 (7.0K) [application/x-gzip]
Saving to: 'XML-SAX-Expat-0.51.tar.gz'
     0K ......                                                100% 1.04G=0s
2017-04-13 07:30:47 (1.04 GB/s) - 'XML-SAX-Expat-0.51.tar.gz' saved [7134/7134]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/perl-XML-SAX-Expat-0.51-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 2892ba5... - updated to 0.51 - safer way to disable post-install step in Makefile.PL
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-SAX-Expat-0.51-1
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.71729
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf XML-SAX-Expat-0.51
Begin-TLD-Builder-Info
Build-Time: user:0.53s sys:0.10s real:3.70s (faults io:0 non-io:80408)
Files queued for ftp:
     12147 perl-XML-SAX-Expat-0.51-1.src.rpm
       195 perl-XML-SAX-Expat-0.51-1.src.rpm.uploadinfo
End-TLD-Builder-Info