[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http -bs  -r HEAD  -Tp auto/ti/ -tt  xorg-driver-video-siliconmotion.spec 2>&1
builder: SMP make flags are set to -j2
Cloning into 'xorg-driver-video-siliconmotion'...
230f3f6dcf1c55f81010c3edbb2d987df5216989
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-driver-video-siliconmotion-1.7.8-1...
Searching for tag auto/ti/xorg-driver-video-siliconmotion-1_7_8-1...
--2015-05-14 11:20:34--  http://distfiles.pld-linux.org/distfiles/by-md5/4/6/46846be22f9e68db941abca7cd9334d9/xf86-video-siliconmotion-1.7.8.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: 398928 (390K) [application/x-bzip2]
Saving to: 'xf86-video-siliconmotion-1.7.8.tar.bz2'
     0K .......... .......... .......... .......... .......... 12%  815K 0s
    50K .......... .......... .......... .......... .......... 25% 1.53M 0s
   100K .......... .......... .......... .......... .......... 38% 1.58M 0s
   150K .......... .......... .......... .......... .......... 51% 1.66M 0s
   200K .......... .......... .......... .......... .......... 64% 11.5M 0s
   250K .......... .......... .......... .......... .......... 77% 1.81M 0s
   300K .......... .......... .......... .......... .......... 89% 11.6M 0s
   350K .......... .......... .......... .........            100% 10.9M=0.2s
2015-05-14 11:20:35 (1.98 MB/s) - 'xf86-video-siliconmotion-1.7.8.tar.bz2' saved [398928/398928]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-driver-video-siliconmotion-1.7.8-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/xorg-driver-video-siliconmotion-1.7.8-1
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.32772
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xf86-video-siliconmotion-1.7.8
Begin-PLD-Builder-Info
Build-Time: user:2.91s sys:1.48s real:15.32s (faults io:0 non-io:198616)
Files queued for ftp:
    405035 xorg-driver-video-siliconmotion-1.7.8-1.src.rpm
       209 xorg-driver-video-siliconmotion-1.7.8-1.src.rpm.uploadinfo
End-PLD-Builder-Info