[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http --define '_tld_builder 1' -bs  -r HEAD  -Tp auto/ti/ -tt   pam-pam_krb5.spec 2>&1
Cloning into 'pam-pam_krb5'...
From git://git.pld-linux.org/packages/pam-pam_krb5
 * [new ref]         refs/notes/commits -> refs/notes/commits
0fa614850280795fd4a923201d63e27dfd5a91da
Already on 'master'
Your branch is up-to-date with 'origin/master'.
Already up-to-date.
Available branches: AC-branch master
Searching for tag auto/ti/pam-pam_krb5-4.6-1...
Searching for tag auto/ti/pam-pam_krb5-4_6-1...
--2017-07-04 22:47:42--  http://distfiles.pld-linux.org/distfiles/by-md5/2/9/296e9c8281419ce1fc41d537d18f74b8/pam-krb5-4.6.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: 528901 (517K) [application/x-gzip]
Saving to: 'pam-krb5-4.6.tar.gz'
     0K .......... .......... .......... .......... ..........  9% 1.00M 0s
    50K .......... .......... .......... .......... .......... 19% 1.99M 0s
   100K .......... .......... .......... .......... .......... 29% 75.2M 0s
   150K .......... .......... .......... .......... .......... 38% 65.8M 0s
   200K .......... .......... .......... .......... .......... 48% 2.10M 0s
   250K .......... .......... .......... .......... .......... 58% 68.6M 0s
   300K .......... .......... .......... .......... .......... 67% 87.2M 0s
   350K .......... .......... .......... .......... .......... 77% 87.6M 0s
   400K .......... .......... .......... .......... .......... 87% 2.17M 0s
   450K .......... .......... .......... .......... .......... 96%  105M 0s
   500K .......... ......                                     100%  164M=0.1s
2017-07-04 22:47:42 (4.11 MB/s) - 'pam-krb5-4.6.tar.gz' saved [528901/528901]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/pam-pam_krb5-4.6-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
Writing git revision for tag auto/ti/pam-pam_krb5-4.6-1
Tag auto/ti/pam-pam_krb5-4.6-1 already exists
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.48795
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf pam-krb5-4.6
Begin-TLD-Builder-Info
Build-Time: user:0.96s sys:0.28s real:2.47s (faults io:0 non-io:88694)
End-TLD-Builder-Info