[...]

builder: SMP make flags are set to -j2
Cloning into 'libthai'...
ca680ddcbb4b8fbe9f4299b9709b1bf5441b325a
Already on 'master'
Your branch is up to date with 'origin/master'.
Already up to date.
Available branches: master
Searching for tag auto/ti/libthai-0.1.28-1...
Searching for tag auto/ti/libthai-0_1_28-1...
--2019-01-16 14:23:54--  http://distfiles.pld-linux.org/by-md5/a/b/aba40accba3831298d50b1b672dd2e68/libthai-0.1.28.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: 413592 (404K) [application/octet-stream]
Saving to: 'libthai-0.1.28.tar.xz'
     0K .......... .......... .......... .......... .......... 12%  544K 1s
    50K .......... .......... .......... .......... .......... 24% 1.06M 0s
   100K .......... .......... .......... .......... .......... 37% 34.1M 0s
   150K .......... .......... .......... .......... .......... 49% 23.5M 0s
   200K .......... .......... .......... .......... .......... 61% 1.13M 0s
   250K .......... .......... .......... .......... .......... 74% 37.9M 0s
   300K .......... .......... .......... .......... .......... 86% 37.7M 0s
   350K .......... .......... .......... .......... .......... 99% 34.4M 0s
   400K ...                                                   100% 71.7M=0.2s
2019-01-16 14:23:54 (2.09 MB/s) - 'libthai-0.1.28.tar.xz' saved [413592/413592]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libthai-0.1.28-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/libthai-0.1.28-1
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.43731
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libthai-0.1.28
Begin-TLD-Builder-Info
Build-Time: user:0.99s sys:0.21s real:3.06s (faults io:0 non-io:91420)
Files queued for ftp:
    419601 libthai-0.1.28-1.src.rpm
       186 libthai-0.1.28-1.src.rpm.uploadinfo
End-TLD-Builder-Info