/usr/lib/x86_64-linux-gnu/pkgconfig/qca2.pc is in libqca2-dev 2.1.3-2ubuntu2.
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=/usr
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/QtCrypto
Name: QCA
Description: Qt Cryptographic Architecture library
Version: 2.1.3
Requires: QtCore
Libs: -L${libdir} -lqca
Cflags: -I${includedir}
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