[...]

No conditional flags passed
from available:
--with   :	 tests
--without:	
Available branches: master
Searching for tag auto/ti/protobuf-c-1.3.1-2...
Searching for tag auto/ti/protobuf-c-1_3_1-2...
--2019-03-14 12:10:37--  http://distfiles.pld-linux.org/by-md5/a/b/ab3aa79312ed7b1fca401c8682e3aa7a/protobuf-c-1.3.1.tar.gz
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: 128705 (126K) [application/x-gzip]
Saving to: 'protobuf-c-1.3.1.tar.gz'
     0K .......... .......... .......... .......... .......... 39%  553K 0s
    50K .......... .......... .......... .......... .......... 79% 1.08M 0s
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2019-03-14 12:10:37 (926 KB/s) - 'protobuf-c-1.3.1.tar.gz' saved [128705/128705]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/protobuf-c-1.3.1-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	 tests
--without:	
Writing git revision for tag auto/ti/protobuf-c-1.3.1-2
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.21011
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf protobuf-c-1.3.1
Begin-TLD-Builder-Info
Build-Time: user:0.62s sys:0.09s real:2.23s (faults io:3 non-io:94584)
Files queued for ftp:
    134824 protobuf-c-1.3.1-2.src.rpm
       188 protobuf-c-1.3.1-2.src.rpm.uploadinfo
End-TLD-Builder-Info