/usr/lib/x86_64-linux-gnu/pkgconfig/libpci.pc is in libpci-dev 1:3.2.1-1ubuntu5.
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
includedir=/usr/include
libdir=/usr/lib/x86_64-linux-gnu
idsdir=/usr/share/misc
Name: libpci
Description: libpci
Version: 3.2.1
Libs: -L${libdir} -lpci
Libs.private: -lresolv -lz
Cflags: -I${includedir}
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