/usr/lib/x86_64-linux-gnu/pkgconfig/libmb.pc is in libmatchbox-dev 1.9-osso8-4.
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=${prefix}/include
Name: libmb
Description: Utility Library used by Matchbox utilities.
Version: 1.9
Requires.private: x11 xext pango pangoxft
Libs: -L${libdir} -lmb
Libs.private: -lX11 -lXext -lpng -lz -ljpeg -lXsettings-client
Cflags: -I${includedir}
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