[...]

x-2.11.1-1
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean):  env -i TMP=/home/users/builder/tmp PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin HOME=/home/users/builder TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.49346
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf postfix-2.11.1
Begin-PLD-Builder-Info
Build-Time: user:0.79s sys:0.17s real:2.43s (faults io:0 non-io:574846)
Files queued for ftp:
   4085893 postfix-2.11.1-1.src.rpm
       192 postfix-2.11.1-1.src.rpm.uploadinfo
End-PLD-Builder-Info