[...]

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'...
85320f520e4cba61702cb95872e8230a6ef8d8d7
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-0.24-1...
Searching for tag auto/ti/libwacom-0_24-1...
--2017-07-04 17:51:37--  http://distfiles.pld-linux.org/distfiles/by-md5/c/9/c9ac71bc1e37cf7159c46f507fef9fce/libwacom-0.24.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: 488313 (477K) [application/x-bzip2]
Saving to: 'libwacom-0.24.tar.bz2'
     0K .......... .......... .......... .......... .......... 10% 1.03M 0s
    50K .......... .......... .......... .......... .......... 20% 2.11M 0s
   100K .......... .......... .......... .......... .......... 31% 26.5M 0s
   150K .......... .......... .......... .......... .......... 41%  186M 0s
   200K .......... .......... .......... .......... .......... 52% 2.00M 0s
   250K .......... .......... .......... .......... .......... 62% 63.1M 0s
   300K .......... .......... .......... .......... .......... 73% 53.3M 0s
   350K .......... .......... .......... .......... .......... 83% 85.2M 0s
   400K .......... .......... .......... .......... .......... 94% 2.51M 0s
   450K .......... .......... ......                          100%  262M=0.1s
2017-07-04 17:51:37 (3.91 MB/s) - 'libwacom-0.24.tar.bz2' saved [488313/488313]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libwacom-0.24-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/libwacom-0.24-1
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.39300
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libwacom-0.24
Begin-TLD-Builder-Info
Build-Time: user:0.83s sys:0.29s real:2.63s (faults io:0 non-io:86946)
Files queued for ftp:
    493227 libwacom-0.24-1.src.rpm
       185 libwacom-0.24-1.src.rpm.uploadinfo
End-TLD-Builder-Info