/usr/lib/x86_64-linux-gnu/pkgconfig/libv4l1.pc is in libv4l-dev 1.12.3-1.
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=${prefix}
includedir=${prefix}/include
libdir=${prefix}/lib/x86_64-linux-gnu
Name: libv4l1
Description: v4l1 compatibility library
Version: 1.12.3
Requires.private: libv4l2
Libs: -L${libdir} -lv4l1
Libs.private: -lpthread
Cflags: -I${includedir}
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