[...]

Saving to: 'libtorrent-0.13.8.tar.gz'
     0K .......... .......... .......... .......... ..........  6%  628K 1s
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   750K .......... .......... .......... .......... .......... 98%  186M 0s
   800K .......... ....                                       100%  208M=0.2s
2019-09-21 14:58:35 (3.93 MB/s) - 'libtorrent-0.13.8.tar.gz' saved [834027/834027]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libtorrent-0.13.8-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	
--without:	 ipv6 static_libs
Writing git revision for tag auto/ti/libtorrent-0.13.8-1
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.8575
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libtorrent-0.13.8
Begin-TLD-Builder-Info
Build-Time: user:1.39s sys:0.56s real:5.14s (faults io:0 non-io:103591)
Files queued for ftp:
    840993 libtorrent-0.13.8-1.src.rpm
       189 libtorrent-0.13.8-1.src.rpm.uploadinfo
End-TLD-Builder-Info