[...]

ulimit: exceeds allowable limit
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libarchive-3.5.1-1.src.rpm
real 0.37
user 0.32
sys 0.03
exit status 0
Writing package revision
builder: SMP make flags are set to -j2
Already up to date.
No conditional flags passed
from available:
--with   :	
--without:	 static_libs
Available branches: AC-branch master
libarchive-3.5.1.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/libarchive-3.5.1-1.src.rpm
real 0.34
user 0.31
sys 0.02
Writing git revision for tag tld/libarchive-3.5.1-1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.48s sys:0.78s real:9.35s (faults io:116 non-io:129446)
Files queued for ftp:
   4905656 libarchive-3.5.1-1.src.rpm
       188 libarchive-3.5.1-1.src.rpm.uploadinfo
End-TLD-Builder-Info