/usr/lib/x86_64-linux-gnu/pkgconfig/tre.pc is in libtre-dev 0.8.0-6.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: TRE
Description: TRE regexp matching library
Version: 0.8.0
Libs: -L${libdir} -ltre -Wl,-z,relro
Cflags: -I${includedir} -Wdate-time -D_FORTIFY_SOURCE=2
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