[...]

No conditional flags passed
from available:
--with   :	
--without:	 prof
Available branches: master
Searching for tag auto/ti/ghc-mtl-2.1.2-1...
Searching for tag auto/ti/ghc-mtl-2_1_2-1...
--2017-10-21 14:30:03--  http://distfiles.pld-linux.org/distfiles/by-md5/9/4/943c110524d96126bfa0e61f7df1ebcd/mtl-2.1.2.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: 13723 (13K) [application/x-gzip]
Saving to: 'mtl-2.1.2.tar.gz'
     0K .......... ...                                        100%  180M=0s
2017-10-21 14:30:03 (180 MB/s) - 'mtl-2.1.2.tar.gz' saved [13723/13723]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/ghc-mtl-2.1.2-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 765a4cf... - complete ghc dependencies list, noautocompressdoc *.haddock
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-2.1.2-1
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.52601
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf mtl-2.1.2
Begin-TLD-Builder-Info
Build-Time: user:0.60s sys:0.14s real:3.48s (faults io:0 non-io:90959)
Files queued for ftp:
     19597 ghc-mtl-2.1.2-1.src.rpm
       185 ghc-mtl-2.1.2-1.src.rpm.uploadinfo
End-TLD-Builder-Info