[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http --define '_tld_builder 1' -bs  -r HEAD  -Tp auto/ti/ -tt   libwacom.spec 2>&1
Cloning into 'libwacom'...
34afeac717b2b72ef1bb54246618582ae0713712
Already on 'master'
Your branch is up-to-date with 'origin/master'.
Already up-to-date.
Available branches: master
Searching for tag auto/ti/libwacom-0.23-1...
Searching for tag auto/ti/libwacom-0_23-1...
--2017-04-07 12:16:33--  http://distfiles.pld-linux.org/distfiles/by-md5/b/f/bfd4394bdff3293e027c9ca1eac58ebd/libwacom-0.23.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: 473700 (463K) [application/x-bzip2]
Saving to: 'libwacom-0.23.tar.bz2'
     0K .......... .......... .......... .......... .......... 10% 1.05M 0s
    50K .......... .......... .......... .......... .......... 21% 2.11M 0s
   100K .......... .......... .......... .......... .......... 32% 75.1M 0s
   150K .......... .......... .......... .......... .......... 43% 83.4M 0s
   200K .......... .......... .......... .......... .......... 54% 2.15M 0s
   250K .......... .......... .......... .......... .......... 64% 72.1M 0s
   300K .......... .......... .......... .......... .......... 75% 73.9M 0s
   350K .......... .......... .......... .......... .......... 86%  147M 0s
   400K .......... .......... .......... .......... .......... 97% 2.30M 0s
   450K .......... ..                                         100%  111M=0.1s
2017-04-07 12:16:33 (3.87 MB/s) - 'libwacom-0.23.tar.bz2' saved [473700/473700]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libwacom-0.23-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/libwacom-0.23-1
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.90243
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libwacom-0.23
Begin-TLD-Builder-Info
Build-Time: user:0.89s sys:0.27s real:2.43s (faults io:0 non-io:85899)
Files queued for ftp:
    478789 libwacom-0.23-1.src.rpm
       185 libwacom-0.23-1.src.rpm.uploadinfo
End-TLD-Builder-Info