/usr/lib/x86_64-linux-gnu/pkgconfig/libftdi1.pc is in libftdi1-dev 1.4-1build1.
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 | prefix=/usr
exec_prefix=/usr/bin
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/libftdi1
Name: libftdi1
Description: Library to program and control the FTDI USB controller
Requires: libusb-1.0
Version: 1.4
Libs: -L${libdir} -lftdi1
Cflags: -I${includedir}
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