[...]

+ cd /tmp/B.Zzfqtz/BUILD
+ cd webkit-qtwebkit-5.212.0-alpha2
+ mkdir -p build
+ cd build
+ CFLAGS='-O2 -fwrapv -pipe -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fno-strict-aliasing -fstack-protector --param=ssp-buffer-size=4 -fomit-frame-pointer -march=i686 -fasynchronous-unwind-tables -mtune=pentium4 ' 
+ export CFLAGS
+ CXXFLAGS='-O2 -fwrapv -pipe -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fno-strict-aliasing -fstack-protector --param=ssp-buffer-size=4 -fomit-frame-pointer -march=i686 -fasynchronous-unwind-tables -mtune=pentium4  -fpermissive' 
+ export CXXFLAGS
+ cmake '-DPORT=Qt' '-DCMAKE_BUILD_TYPE=Release' '-DENABLE_TOOLS=OFF' '-DCMAKE_C_FLAGS_RELEASE:STRING=-DNDEBUG' '-DCMAKE_CXX_FLAGS_RELEASE:STRING=-DNDEBUG' '-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON' ..
-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found BISON: /usr/bin/bison (found suitable version "3.4.1", minimum required is "2.1") 
-- Found Gperf: /usr/bin/gperf (Required is at least version "3.0.1") 
-- Found Perl: /usr/bin/perl (found suitable version "5.28.2", minimum required is "5.10.0") 
-- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.16", minimum required is "2.7.0") 
-- Could NOT find Ruby (missing: RUBY_EXECUTABLE RUBY_INCLUDE_DIR RUBY_LIBRARY) (Required is at least version "1.9")
CMake Error at Source/cmake/WebKitCommon.cmake:34 (message):
  Ruby 1.9 or higher is required.
Call Stack (most recent call first):
  CMakeLists.txt:140 (include)
-- Configuring incomplete, errors occurred!
See also "/tmp/B.Zzfqtz/BUILD/webkit-qtwebkit-5.212.0-alpha2/build/CMakeFiles/CMakeOutput.log".
error: Bad exit status from /tmp/B.Zzfqtz/BUILD/tmp/rpm-tmp.46570 (%build)
RPM build errors:
    Bad exit status from /tmp/B.Zzfqtz/BUILD/tmp/rpm-tmp.46570 (%build)
ended at: Sat Aug 17 00:27:32 2019, done in 0:01:22.367025
error: No files produced.
+ chmod -R u+rwX /tmp/B.Zzfqtz/BUILD
+ rm -rf /tmp/B.Zzfqtz/tmp /tmp/B.Zzfqtz/BUILD
+ rm -rf /tmp/B.Zzfqtz
Begin-TLD-Builder-Info
Build-Time: user:21.28s sys:11.25s real:188.97s (faults io:28 non-io:292271)
End-TLD-Builder-Info