/usr/lib/x86_64-linux-gnu/libQt5WebSockets.prl is in libqt5websockets5-dev 5.7.1~20161021-4.
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/qtwebsockets-opensource-src-biuG2t/qtwebsockets-opensource-src-5.7.1~20161021/src/websockets
QMAKE_PRO_INPUT = websockets.pro
QMAKE_PRL_TARGET = libQt5WebSockets.so.5.7.1
QMAKE_PRL_CONFIG = lex yacc depend_includepath testcase_targets import_plugins import_qpa_plugin qt_build_extra file_copies qt warn_on release link_prl incremental shared qpa release qt_no_framework linux unix posix gcc compile_examples system-sqlite qpa largefile nostrip precompile_header use_gold_linker enable_new_dtags sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512er avx512cd avx512pf avx512dq avx512bw avx512vl avx512ifma avx512vbmi use_libmysqlclient_r prefix_build force_independent create_prl link_prl prepare_docs qt_docs_targets no_private_qt_headers_warning QTDIR_build qt_example_installs exceptions_off testcase_exceptions explicitlib warning_clean relative_qt_rpath qmake_cache target_qt c++11 strict_c++ c++14 c++1z hide_symbols bsymbolic_functions qt_install_headers need_fwd_pri qt_install_module create_cmake compiler_supports_fpmath create_pc create_libtool have_target dll thread moc resources
QMAKE_PRL_VERSION = 5.7.1
QMAKE_PRL_LIBS = -lQt5Network -lQt5Core -lpthread
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