/usr/lib/pkgconfig/libzen.pc is in libzen-dev 0.4.29-1.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Unicode=yes
WstringMissing=no
Libs_Static=${prefix}/lib/x86_64-linux-gnu/libzen.a -lpthread
Name: libzen
Version: 0.4.290.4.25
Description: ZenLib
Libs: -L${prefix}/lib/x86_64-linux-gnu -lzen -lpthread -lstdc++
Cflags: -I${includedir} -DUNICODE -DSIZE_T_IS_LONG
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