[...]

Building for target x86_64-linux
Wrote: /home/users/builder/rpm/SRPMS/qt5-qttools-5.15.13-2.src.rpm
RPM build warnings:
    Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
real 0.30
user 0.27
sys 0.02
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 87: %{?with_qtwebkit:WebKitWidgets}
Building qt5-qttools.spec with the following conditional flags:
 --with bootstrap
from available:
--with   :	 <bootstrap>
--without:	 doc qm qtdeclarative qtwebkit
Available branches: master
qttools-everywhere-opensource-src-5.15.13.tar.xz having proper md5sum already exists
qttranslations-everywhere-opensource-src-5.15.13.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: unlimited exceeds allowable coredump(blocks) limit
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
Building target platforms: x86_64-linux
Building for target x86_64-linux
Wrote: /home/users/builder/rpm/SRPMS/qt5-qttools-5.15.13-2.src.rpm
RPM build warnings:
    Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
real 0.30
user 0.28
sys 0.02
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
Writing git revision for tag tld/qt5-qttools-5.15.13-2
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.46s sys:0.40s real:5.00s (faults io:0 non-io:188301)
Files queued for ftp:
  10552274 qt5-qttools-5.15.13-2.src.rpm
       191 qt5-qttools-5.15.13-2.src.rpm.uploadinfo
End-TLD-Builder-Info