[...]

Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/postfix-3.7.0-2.src.rpm
real 0.36
user 0.33
sys 0.03
exit status 0
Writing package revision
builder: SMP make flags are set to -j2
Already up to date.
warning: line 81: It's not recommended to have unversioned Obsoletes: Obsoletes:	smtpdaemon
warning: Macro expanded in comment on line 423: %{_sysconfdir}/postfix/regexp_table
warning: Macro expanded in comment on line 428: %{_sysconfdir}/postfix/*.db
No conditional flags passed
from available:
--with   :	
--without:	 cdb epoll ldap mysql pgsql sasl sqlite ssl
Available branches: TLD-2018 master postfix-3.5
postfix-3.7.0.tar.gz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: line 81: It's not recommended to have unversioned Obsoletes: Obsoletes:	smtpdaemon
warning: Macro expanded in comment on line 423: %{_sysconfdir}/postfix/regexp_table
warning: Macro expanded in comment on line 428: %{_sysconfdir}/postfix/*.db
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/postfix-3.7.0-2.src.rpm
real 0.39
user 0.35
sys 0.03
warning: line 81: It's not recommended to have unversioned Obsoletes: Obsoletes:	smtpdaemon
warning: Macro expanded in comment on line 423: %{_sysconfdir}/postfix/regexp_table
warning: Macro expanded in comment on line 428: %{_sysconfdir}/postfix/*.db
Writing git revision for tag tld/postfix-3.7.0-2
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:2.67s sys:2.46s real:4.16s (faults io:16 non-io:356778)
Files queued for ftp:
   4852605 postfix-3.7.0-2.src.rpm
       185 postfix-3.7.0-2.src.rpm.uploadinfo
End-TLD-Builder-Info