[...]

r md5sum already exists
SpecialCasing.txt having proper md5sum already exists
UnicodeData.txt having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: Macro expanded in comment on line 297: %{version},%{release} macros may not be used directly as they take last
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/ruby-2.6.10-4.src.rpm
real 3.36
user 2.84
sys 0.10
warning: Macro expanded in comment on line 297: %{version},%{release} macros may not be used directly as they take last
Writing git revision for tag tld/ruby-2.6.10-4
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:8.19s sys:2.31s real:17.67s (faults io:36 non-io:477671)
Files queued for ftp:
  52584852 ruby-2.6.10-4.src.rpm
       183 ruby-2.6.10-4.src.rpm.uploadinfo
End-TLD-Builder-Info