[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http -bs  -r HEAD  -Tp auto/ti/ -tt  libtirpc.spec 2>&1
builder: SMP make flags are set to -j2
Cloning into 'libtirpc'...
c0f0e59c2706102213bb88c16e08e555467593ac
Already on 'master'
Already up-to-date.
Available branches: master
Searching for tag auto/ti/libtirpc-0.2.5-1...
Searching for tag auto/ti/libtirpc-0_2_5-1...
--2015-02-04 12:51:54--  http://distfiles.pld-linux.org/distfiles/by-md5/8/c/8cd41a5ef5a9b50d0fb6abb98af15368/libtirpc-0.2.5.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: 459094 (448K) [application/x-bzip2]
Saving to: 'libtirpc-0.2.5.tar.bz2'
     0K .......... .......... .......... .......... .......... 11%  514K 1s
    50K .......... .......... .......... .......... .......... 22%  516K 1s
   100K .......... .......... .......... .......... .......... 33%  754K 1s
   150K .......... .......... .......... .......... .......... 44%  524K 0s
   200K .......... .......... .......... .......... .......... 55%  771K 0s
   250K .......... .......... .......... .......... .......... 66%  779K 0s
   300K .......... .......... .......... .......... .......... 78% 1.37M 0s
   350K .......... .......... .......... .......... .......... 89%  782K 0s
   400K .......... .......... .......... .......... ........  100% 1.38M=0.6s
2015-02-04 12:51:55 (725 KB/s) - 'libtirpc-0.2.5.tar.bz2' saved [459094/459094]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libtirpc-0.2.5-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/libtirpc-0.2.5-1
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.66765
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf libtirpc-0.2.5
Begin-PLD-Builder-Info
Build-Time: user:2.77s sys:1.48s real:10.59s (faults io:0 non-io:198218)
Files queued for ftp:
    466254 libtirpc-0.2.5-1.src.rpm
       186 libtirpc-0.2.5-1.src.rpm.uploadinfo
End-PLD-Builder-Info