/usr/lib/pkgconfig/libusbmuxd.pc is in libusbmuxd-dev 1.0.8-2ubuntu1.
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=/usr
libdir=/usr/lib
includedir=/usr/include
Name: libusbmuxd
Description: A library to communicate with the usbmux daemon
Version: 1.0.8
Libs: -L/usr/lib -lusbmuxd
Cflags: -I/usr/include
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