[...]

No conditional flags passed
from available:
--with   :	
--without:	 static_libs
Available branches: AC-branch RA-branch master
Searching for tag auto/ti/libebml-1.3.6-1...
Searching for tag auto/ti/libebml-1_3_6-1...
--2019-05-29 12:52:36--  http://distfiles.pld-linux.org/by-md5/3/e/3e2bc574bb22582c724ab659652fe0db/libebml-1.3.6.tar.xz
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: 57764 (56K) [application/octet-stream]
Saving to: 'libebml-1.3.6.tar.xz'
     0K .......... .......... .......... .......... .......... 88%  580K 0s
    50K ......                                                100%  107M=0.09s
2019-05-29 12:52:36 (654 KB/s) - 'libebml-1.3.6.tar.xz' saved [57764/57764]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libebml-1.3.6-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	
--without:	 static_libs
Writing git revision for tag auto/ti/libebml-1.3.6-1
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.20572
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libebml-1.3.6
Begin-TLD-Builder-Info
Build-Time: user:0.72s sys:0.11s real:2.79s (faults io:0 non-io:100523)
Files queued for ftp:
     63324 libebml-1.3.6-1.src.rpm
       185 libebml-1.3.6-1.src.rpm.uploadinfo
End-TLD-Builder-Info