[...]

Building target platforms: x86_64-linux
Building for target x86_64-linux
Wrote: /home/users/builder/rpm/SRPMS/libxcb-1.16.1-1.src.rpm
RPM build warnings:
    Macro expanded in comment on line 13: %{name}-%{version}.tar.bz2
real 0.04
user 0.04
sys 0.00
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 13: %{name}-%{version}.tar.bz2
No conditional flags passed
from available:
--with   :	
--without:	 apidocs graphviz
Available branches: master
libxcb-1.16.1.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: unlimited exceeds allowable coredump(blocks) limit
warning: Macro expanded in comment on line 13: %{name}-%{version}.tar.bz2
Building target platforms: x86_64-linux
Building for target x86_64-linux
Wrote: /home/users/builder/rpm/SRPMS/libxcb-1.16.1-1.src.rpm
RPM build warnings:
    Macro expanded in comment on line 13: %{name}-%{version}.tar.bz2
real 0.04
user 0.03
sys 0.01
warning: Macro expanded in comment on line 13: %{name}-%{version}.tar.bz2
Writing git revision for tag tld/libxcb-1.16.1-1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:0.79s sys:0.25s real:3.13s (faults io:0 non-io:148986)
Files queued for ftp:
    470350 libxcb-1.16.1-1.src.rpm
       185 libxcb-1.16.1-1.src.rpm.uploadinfo
End-TLD-Builder-Info