[...]

rror: 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.66384
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf pari-2.5.5
Begin-PLD-Builder-Info
Build-Time: user:4.09s sys:2.87s real:8.39s (faults io:4 non-io:440422)
Files queued for ftp:
   3278703 parigp-2.5.5-7.src.rpm
       184 parigp-2.5.5-7.src.rpm.uploadinfo
End-PLD-Builder-Info