[...]

builder: SMP make flags are set to -j2
Cloning into 'xorg-lib-libXfont'...
From git://git.pld-linux.org/packages/xorg-lib-libXfont
 * [new ref]         refs/notes/commits -> refs/notes/commits
602cceaa2a03354e37b413ec2c29d918859908e8
Already on 'master'
Your branch is up-to-date with 'origin/master'.
Already up-to-date.
Available branches: master
Searching for tag auto/ti/xorg-lib-libXfont-1.5.1-1...
Searching for tag auto/ti/xorg-lib-libXfont-1_5_1-1...
--2015-05-08 12:38:25--  http://distfiles.pld-linux.org/distfiles/by-md5/9/6/96f76ba94b4c909230bac1e2dcd551c4/libXfont-1.5.1.tar.bz2
Resolving distfiles.pld-linux.org (distfiles.pld-linux.org)... 193.239.45.41
Connecting to distfiles.pld-linux.org (distfiles.pld-linux.org)|193.239.45.41|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 502903 (491K) [application/x-bzip2]
Saving to: 'libXfont-1.5.1.tar.bz2'
     0K .......... .......... .......... .......... .......... 10%  808K 1s
    50K .......... .......... .......... .......... .......... 20% 1.54M 0s
   100K .......... .......... .......... .......... .......... 30% 1.57M 0s
   150K .......... .......... .......... .......... .......... 40% 1.69M 0s
   200K .......... .......... .......... .......... .......... 50% 10.9M 0s
   250K .......... .......... .......... .......... .......... 61% 1.79M 0s
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   350K .......... .......... .......... .......... .......... 81% 10.8M 0s
   400K .......... .......... .......... .......... .......... 91% 2.05M 0s
   450K .......... .......... .......... .......... .         100% 10.8M=0.2s
2015-05-08 12:38:25 (2.16 MB/s) - 'libXfont-1.5.1.tar.bz2' saved [502903/502903]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-lib-libXfont-1.5.1-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/xorg-lib-libXfont-1.5.1-1
Tag auto/ti/xorg-lib-libXfont-1.5.1-1 already exists
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.9769
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libXfont-1.5.1
Begin-PLD-Builder-Info
Build-Time: user:2.63s sys:1.25s real:9.81s (faults io:0 non-io:189950)
End-PLD-Builder-Info