[...]

No conditional flags passed
from available:
--with   :	
--without:	 prof
Available branches: master
Searching for tag auto/ti/ghc-mtl-2.2.1-1...
Searching for tag auto/ti/ghc-mtl-2_2_1-1...
--2017-10-21 12:56:52--  http://distfiles.pld-linux.org/distfiles/by-md5/9/6/96a2f12b94ea8d7cb0aea999cd2e3802/mtl-2.2.1.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: 15391 (15K) [application/x-gzip]
Saving to: 'mtl-2.2.1.tar.gz'
     0K .......... .....                                      100%  676K=0.02s
2017-10-21 12:56:53 (676 KB/s) - 'mtl-2.2.1.tar.gz' saved [15391/15391]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/ghc-mtl-2.2.1-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 0f3a2ca... - up to 2.2.1 - bump required transformers version
fatal: HEAD does not point to a branch
No conditional flags passed
from available:
--with   :	
--without:	 prof
Writing git revision for tag auto/ti/ghc-mtl-2.2.1-1
On detached HEAD. Use -r BRANCHNAME to override
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.28440
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf mtl-2.2.1
Begin-TLD-Builder-Info
Build-Time: user:0.97s sys:0.32s real:2.43s (faults io:3 non-io:91577)
Files queued for ftp:
     21348 ghc-mtl-2.2.1-1.src.rpm
       185 ghc-mtl-2.2.1-1.src.rpm.uploadinfo
End-TLD-Builder-Info