/usr/lib/x86_64-linux-gnu/pkgconfig/libqcow.pc is in libqcow-dev 20170222-3.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libqcow
Description: Library to access the QEMU Copy-On-Write (QCOW) image format
Version: 20170222
Libs: -L${libdir} -lqcow
Libs.private: -lbfio -lpthread -lz
Cflags: -I${includedir}
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