/usr/lib/x86_64-linux-gnu/pkgconfig/qxmpp.pc is in libqxmpp-dev 0.9.3-1build1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/qxmpp
Name: Qxmpp
Description: Qxmpp Library
Version: 0.9.3
Libs: -lqxmpp
Libs.private: -lopus -lspeex -ltheoradec -ltheoraenc -lvpx -lQt5Network -lQt5Xml -lQt5Core -lpthread
Cflags: -DQXMPP_SHARED -I${includedir}
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