[...]

./builder[2756]: ulimit: exceeds allowable limit
warning: line 50: Possible unexpanded macro in: BuildRequires:	qt5-linguist >= %{qttools_linguist_ver}
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/qt5-qttools-5.15.10-1.src.rpm
real 0.50
user 0.47
sys 0.02
exit status 0
Writing package revision
Already up to date.
warning: line 50: Possible unexpanded macro in: BuildRequires:	qt5-linguist >= %{qttools_linguist_ver}
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
No conditional flags passed
from available:
--with   :	 bootstrap
--without:	 doc qm qtdeclarative qtwebkit
Available branches: master
qttools-everywhere-opensource-src-5.15.10.tar.xz having proper md5sum already exists
qttranslations-everywhere-opensource-src-5.15.10.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: line 50: Possible unexpanded macro in: BuildRequires:	qt5-linguist >= %{qttools_linguist_ver}
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/qt5-qttools-5.15.10-1.src.rpm
real 0.51
user 0.48
sys 0.02
warning: line 50: Possible unexpanded macro in: BuildRequires:	qt5-linguist >= %{qttools_linguist_ver}
warning: Macro expanded in comment on line 87: %{?with_qtwebkit:WebKitWidgets}
Writing git revision for tag tld/qt5-qttools-5.15.10-1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.66s sys:0.51s real:7.23s (faults io:1 non-io:132112)
Files queued for ftp:
  10553613 qt5-qttools-5.15.10-1.src.rpm
       191 qt5-qttools-5.15.10-1.src.rpm.uploadinfo
End-TLD-Builder-Info