[...]

Saving to: 'glibc-git.patch'
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   850K                                                       100%  440G=0.01s
2017-10-13 13:59:53 (86.5 MB/s) - 'glibc-git.patch' saved [870636/870636]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/glibc-2.26-4.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	 bash_nls cross tests
--without:	 localedb memusage nss_crypt selinux
Writing git revision for tag auto/ti/glibc-2.26-4
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.37822
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf glibc-2.26
Begin-TLD-Builder-Info
Build-Time: user:1.65s sys:0.39s real:3.65s (faults io:0 non-io:313654)
Files queued for ftp:
  17265242 glibc-2.26-4.src.rpm
       182 glibc-2.26-4.src.rpm.uploadinfo
End-TLD-Builder-Info