[...]

No conditional flags passed
from available:
--with   :	
--without:	 ocaml_opt
Available branches: master
Searching for tag auto/ti/ocaml-ocamlbuild-0.11.0-2...
Searching for tag auto/ti/ocaml-ocamlbuild-0_11_0-2...
--2017-10-19 19:59:27--  http://distfiles.pld-linux.org/distfiles/by-md5/e/3/e3b83c842f82ef909b6d2a2d2035f0fe/ocamlbuild-0.11.0.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: 195297 (191K) [application/x-gzip]
Saving to: 'ocamlbuild-0.11.0.tar.gz'
     0K .......... .......... .......... .......... .......... 26% 1.05M 0s
    50K .......... .......... .......... .......... .......... 52% 2.09M 0s
   100K .......... .......... .......... .......... .......... 78% 62.3M 0s
   150K .......... .......... .......... ..........           100%  153M=0.07s
2017-10-19 19:59:27 (2.63 MB/s) - 'ocamlbuild-0.11.0.tar.gz' saved [195297/195297]
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/ocaml-ocamlbuild-0.11.0-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	
--without:	 ocaml_opt
Writing git revision for tag auto/ti/ocaml-ocamlbuild-0.11.0-2
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.45249
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf ocamlbuild-0.11.0
Begin-TLD-Builder-Info
Build-Time: user:0.89s sys:0.21s real:2.31s (faults io:0 non-io:85888)
Files queued for ftp:
    200451 ocaml-ocamlbuild-0.11.0-2.src.rpm
       195 ocaml-ocamlbuild-0.11.0-2.src.rpm.uploadinfo
End-TLD-Builder-Info