/usr/lib/x86_64-linux-gnu/pkgconfig/matio.pc is in libmatio-dev 1.5.2-3+b1.
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=${prefix}/include
Name: MATIO
Description: MATIO Library
Version: 1.5.2
Libs: -L${libdir} -lmatio -L/usr/lib/x86_64-linux-gnu/hdf5/serial/lib -lhdf5 -lz
Cflags: -I${includedir} -I/usr/lib/x86_64-linux-gnu/hdf5/serial/include
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