/usr/lib/x86_64-linux-gnu/libQtWebKit.prl is in libqtwebkit-dev 2.3.4.dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | QMAKE_PRL_BUILD_DIR = /build/qtwebkit-JSpniR/qtwebkit-2.3.4.dfsg/WebKitBuild/Release/Source/
QMAKE_PRO_INPUT = api.pri
QMAKE_PRL_TARGET = libQtWebKit.so.4.10.4
QMAKE_PRL_CONFIG = include_source_dir lex yacc uic resources lex yacc uic resources qt release incremental link_prl gdb_dwarf_index shared def_files_disabled exceptions no_mocdepend release stl qt_no_framework webkit_configured no_force_sse2 production_build link_pkgconfig root_project_file no_webkit2 include_webinspector no_force_sse2 release production_build production_build ordered config_step depend_includepath nostrip use_all_in_one_files moc thread link_pkgconfig include_webinspector no_force_sse2 release production_build create_pc create_prl config_step depend_includepath nostrip hide_symbols bsymbolic_functions x11 x11lib x11inc dll shared opengl
QMAKE_PRL_VERSION = 4.10.4
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