/usr/lib/x86_64-linux-gnu/pkgconfig/lua5.1-socket.pc is in lua-socket-dev 3.0~rc1-3.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | lua=lua5.1
version=3.0~rc1
lib_name=socket
libs_private=
url=
requires=
conflicts=
prefix=/usr
libdir=${prefix}/lib
includedir=${prefix}/include/${lua}
Name: Lua ${lib_name}
Description: Lua ${lib_name} engine
Version: ${version}
URL: ${url}
Requires: ${requires} lua5.1
Conflicts: ${conflicts}
Libs: -L${libdir} -l${lua}-${lib_name}
Libs.private: ${libs_private}
Cflags: -I${includedir}
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