[...]

builder: SMP make flags are set to -j2
Cloning into 'libthai'...
1272d259079875bb3420cbefe661c6b1034523c9
Already on 'master'
Already up-to-date.
Available branches: master
Searching for tag auto/ti/libthai-0.1.20-1...
Searching for tag auto/ti/libthai-0_1_20-1...
--2014-08-01 05:45:32--  http://distfiles.pld-linux.org/distfiles/by-md5/2/b/2b58148d73361316121d5384efeda9e6/libthai-0.1.20.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: 383820 (375K) [application/octet-stream]
Saving to: 'libthai-0.1.20.tar.xz'
     0K .......... .......... .......... .......... .......... 13%  120K 3s
    50K .......... .......... .......... .......... .......... 26%  174K 2s
   100K .......... .......... .......... .......... .......... 40%  142K 2s
   150K .......... .......... .......... .......... .......... 53%  142K 1s
   200K .......... .......... .......... .......... .......... 66%  130K 1s
   250K .......... .......... .......... .......... .......... 80%  130K 1s
   300K .......... .......... .......... .......... .......... 93%  142K 0s
   350K .......... .......... ....                            100%  156K=2.7s
2014-08-01 05:45:35 (139 KB/s) - 'libthai-0.1.20.tar.xz' saved [383820/383820]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libthai-0.1.20-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Version: 0.1.20
Release: 1
tag: auto/ti/libthai-0.1.20-1
Searching for tag auto/ti/libthai-0.1.20-1...
To ssh://git@git.pld-linux.org/packages/libthai
 * [new tag]         auto/ti/libthai-0.1.20-1 -> auto/ti/libthai-0.1.20-1
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean):  env -i TMP=/home/users/builder/tmp PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin HOME=/home/users/builder TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.68867
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libthai-0.1.20
Begin-PLD-Builder-Info
Build-Time: user:2.46s sys:1.22s real:9.59s (faults io:0 non-io:160452)
Files queued for ftp:
    389699 libthai-0.1.20-1.src.rpm
       186 libthai-0.1.20-1.src.rpm.uploadinfo
End-PLD-Builder-Info