[...]

Length: 782854 (765K) [application/x-gzip]
Saving to: 'libtorrent-0.13.7.tar.gz'
     0K .......... .......... .......... .......... ..........  6%  606K 1s
    50K .......... .......... .......... .......... .......... 13% 1.19M 1s
   100K .......... .......... .......... .......... .......... 19% 61.0M 1s
   150K .......... .......... .......... .......... .......... 26% 34.6M 0s
   200K .......... .......... .......... .......... .......... 32% 1.24M 0s
   250K .......... .......... .......... .......... .......... 39% 65.6M 0s
   300K .......... .......... .......... .......... .......... 45% 62.2M 0s
   350K .......... .......... .......... .......... .......... 52% 74.9M 0s
   400K .......... .......... .......... .......... .......... 58% 1.25M 0s
   450K .......... .......... .......... .......... .......... 65%  227M 0s
   500K .......... .......... .......... .......... .......... 71% 65.7M 0s
   550K .......... .......... .......... .......... .......... 78% 70.6M 0s
   600K .......... .......... .......... .......... .......... 85%  175M 0s
   650K .......... .......... .......... .......... .......... 91%  401K 0s
   700K .......... .......... .......... .......... .......... 98%  304K 0s
   750K .......... ....                                       100%  354K=0.5s
2019-02-28 08:00:19 (1.39 MB/s) - 'libtorrent-0.13.7.tar.gz' saved [782854/782854]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libtorrent-0.13.7-2.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-0.13.7-2
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.97781
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libtorrent-0.13.7
Begin-TLD-Builder-Info
Build-Time: user:1.18s sys:0.33s real:5.24s (faults io:0 non-io:129559)
Files queued for ftp:
    789649 libtorrent-0.13.7-2.src.rpm
       189 libtorrent-0.13.7-2.src.rpm.uploadinfo
End-TLD-Builder-Info