[...]

not point to a branch
Building postgresql.spec with the following conditional flags:
 --without tests
from available:
--with   :	 absolute_dbpaths bonjour systemtap
--without:	 kerberos5 ldap perl python selinux tcl <tests>
Writing git revision for tag auto/ti/postgresql-10.5-1
On detached HEAD. Use -r BRANCHNAME to override
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.72328
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf postgresql-10.5
Begin-TLD-Builder-Info
Build-Time: user:2.53s sys:0.53s real:5.95s (faults io:0 non-io:193295)
Files queued for ftp:
  20274875 postgresql-10.5-1.src.rpm
       187 postgresql-10.5-1.src.rpm.uploadinfo
End-TLD-Builder-Info