/usr/share/perl5/ExtUtils/CBuilder/ is in libextutils-cbuilder-perl 0.280212-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/ExtUtils/CBuilder/Base.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/
/usr/share/perl5/ExtUtils/CBuilder/Platform/Unix.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/VMS.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/Windows/
/usr/share/perl5/ExtUtils/CBuilder/Platform/Windows.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/Windows/BCC.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/Windows/GCC.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/Windows/MSVC.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/aix.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/cygwin.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/darwin.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/dec_osf.pm
/usr/share/perl5/ExtUtils/CBuilder/Platform/os2.pm