[...]

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 97750K .......... .......... .......                         100% 47.0M=5.0s
2019-12-07 12:57:58 (19.0 MB/s) - 'boost_1_71_0.tar.bz2' saved [100124647/100124647]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/boost-1.71.0-4.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	
--without:	 numpy python2 python3
Writing git revision for tag auto/ti/boost-1.71.0-4
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.64104
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf boost_1_71_0
Begin-TLD-Builder-Info
Build-Time: user:4.75s sys:1.01s real:15.01s (faults io:64 non-io:148943)
Files queued for ftp:
  99950058 boost-1.71.0-4.src.rpm
       184 boost-1.71.0-4.src.rpm.uploadinfo
End-TLD-Builder-Info