[...]

Saving to: 'libtorrent-0.13.6.tar.gz'
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2018-03-14 16:56:33 (7.03 MB/s) - 'libtorrent-0.13.6.tar.gz' saved [781253/781253]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libtorrent-0.13.6-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at b91d631... - one more place
fatal: HEAD does not point to a branch
No conditional flags passed
from available:
--with   :	
--without:	 ipv6 static_libs
Writing git revision for tag auto/ti/libtorrent-0.13.6-2
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.28314
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libtorrent-0.13.6
Begin-TLD-Builder-Info
Build-Time: user:0.92s sys:0.29s real:2.50s (faults io:0 non-io:116163)
Files queued for ftp:
    786678 libtorrent-0.13.6-2.src.rpm
       189 libtorrent-0.13.6-2.src.rpm.uploadinfo
End-TLD-Builder-Info