/usr/lib/x86_64-linux-gnu/libqgsttools_p.prl is in qtmultimedia5-dev 5.9.5-0ubuntu1.
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 6 | QMAKE_PRL_BUILD_DIR = /build/qtmultimedia-opensource-src-9cu_Hv/qtmultimedia-opensource-src-5.9.5/src/gsttools
QMAKE_PRO_INPUT = gsttools.pro
QMAKE_PRL_TARGET = libqgsttools_p.so.1.0.0
QMAKE_PRL_CONFIG = lex yacc depend_includepath testcase_targets import_plugins import_qpa_plugin qt_build_extra file_copies qmake_use qt warn_on release link_prl incremental shared release linux unix posix gcc sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c largefile precompile_header nostrip prefix_build force_independent utf8_source create_prl link_prl prepare_docs qt_docs_targets no_private_qt_headers_warning QTDIR_build qt_example_installs exceptions_off testcase_exceptions explicitlib have_target dll thread uic opengl moc resources
QMAKE_PRL_VERSION = 1.0.0
QMAKE_PRL_LIBS = -L/build/qtmultimedia-opensource-src-9cu_Hv/qtmultimedia-opensource-src-5.9.5/lib -lQt5MultimediaWidgets -lQt5Multimedia -lQt5Widgets -lQt5Gui -lQt5Network -lQt5Core -lGL -lpthread -lasound -lgstaudio-1.0 -lgstvideo-1.0 -lgstpbutils-1.0 -lgstapp-1.0 -lgstbase-1.0 -lgstreamer-1.0 -lgobject-2.0 -lpulse-mainloop-glib -lpulse -lglib-2.0
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