[...]

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.60429
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf postgresql-10.5
Begin-TLD-Builder-Info
Build-Time: user:1.47s sys:0.20s real:3.35s (faults io:0 non-io:211479)
Files queued for ftp:
  20264480 postgresql-10-10.5-5.src.rpm
       190 postgresql-10-10.5-5.src.rpm.uploadinfo
End-TLD-Builder-Info