[...]

./builder[2756]: ulimit: exceeds allowable limit
warning: Macro expanded in comment on line 23: %{name}-%{version}.tar.gz
warning: line 59: It's not recommended to have unversioned Obsoletes: Obsoletes:	xml-common
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libxml2-2.9.13-4.src.rpm
real 0.36
user 0.33
sys 0.03
exit status 0
Writing package revision
builder: SMP make flags are set to -j2
Already up to date.
warning: Macro expanded in comment on line 23: %{name}-%{version}.tar.gz
warning: line 59: It's not recommended to have unversioned Obsoletes: Obsoletes:	xml-common
No conditional flags passed
from available:
--with   :	 mem_debug
--without:	 apidocs python2 python3 static_libs tests zlib
Available branches: RA-branch master
libxml2-2.9.13.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: Macro expanded in comment on line 23: %{name}-%{version}.tar.gz
warning: line 59: It's not recommended to have unversioned Obsoletes: Obsoletes:	xml-common
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libxml2-2.9.13-4.src.rpm
real 0.36
user 0.33
sys 0.03
warning: Macro expanded in comment on line 23: %{name}-%{version}.tar.gz
warning: line 59: It's not recommended to have unversioned Obsoletes: Obsoletes:	xml-common
Writing git revision for tag tld/libxml2-2.9.13-4
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:2.10s sys:1.25s real:4.24s (faults io:15 non-io:224298)
Files queued for ftp:
   3259922 libxml2-2.9.13-4.src.rpm
       186 libxml2-2.9.13-4.src.rpm.uploadinfo
End-TLD-Builder-Info