[...]

or: 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.27927
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf proftpd-1.3.6
Begin-TLD-Builder-Info
Build-Time: user:1.49s sys:0.33s real:5.20s (faults io:85 non-io:484371)
Files queued for ftp:
  20248419 proftpd-1.3.6-3.src.rpm
       185 proftpd-1.3.6-3.src.rpm.uploadinfo
End-TLD-Builder-Info