/usr/lib/x86_64-linux-gnu/pkgconfig/texlua52.pc is in libtexlua52-dev 2017.20170613.44572-8ubuntu0.1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Lua for LuaTeX
Description: Lua 5.2, modified for use with LuaTeX
Version: 5.2.4
Libs: -L${libdir} -ltexlua52
Libs.private: -ldl -lm
Cflags: -I${includedir}/texlua52
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