/usr/lib/x86_64-linux-gnu/pkgconfig/mozjs-52.pc is in libmozjs-52-dev 52.3.1-7fakesync1.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu/
includedir=${prefix}/include
Name: SpiderMonkey 52.3.1
Description: The Mozilla library for JavaScript
Version: 52.3.1
Libs: -L${libdir} -lmozjs-52
Cflags: -include ${includedir}/mozjs-52/js/RequiredDefines.h -I${includedir}/mozjs-52
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