[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http -bs  -r HEAD  -Tp auto/ti/ -tt  xorg-driver-video-nv.spec 2>&1
builder: SMP make flags are set to -j2
Cloning into 'xorg-driver-video-nv'...
22dcec601884f5f270dff316e724f2e716232f8f
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-nv-2.1.20-8...
Searching for tag auto/ti/xorg-driver-video-nv-2_1_20-8...
--2015-07-07 16:20:34--  http://distfiles.pld-linux.org/distfiles/by-md5/e/2/e263dd0cd149b5224e92baa5a227bb00/xf86-video-nv-2.1.20.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: 396982 (388K) [application/x-bzip2]
Saving to: 'xf86-video-nv-2.1.20.tar.bz2'
     0K .......... .......... .......... .......... .......... 12%  817K 0s
    50K .......... .......... .......... .......... .......... 25% 1.54M 0s
   100K .......... .......... .......... .......... .......... 38% 1.58M 0s
   150K .......... .......... .......... .......... .......... 51% 1.69M 0s
   200K .......... .......... .......... .......... .......... 64% 11.6M 0s
   250K .......... .......... .......... .......... .......... 77% 1.99M 0s
   300K .......... .......... .......... .......... .......... 90% 7.42M 0s
   350K .......... .......... .......... .......              100% 11.5M=0.2s
2015-07-07 16:20:34 (1.98 MB/s) - 'xf86-video-nv-2.1.20.tar.bz2' saved [396982/396982]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-driver-video-nv-2.1.20-8.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/xorg-driver-video-nv-2.1.20-8
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.18931
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xf86-video-nv-2.1.20
Begin-PLD-Builder-Info
Build-Time: user:2.88s sys:1.48s real:5.34s (faults io:0 non-io:215469)
Files queued for ftp:
    405333 xorg-driver-video-nv-2.1.20-8.src.rpm
       199 xorg-driver-video-nv-2.1.20-8.src.rpm.uploadinfo
End-PLD-Builder-Info