/usr/lib/pkgconfig/frei0r.pc is in frei0r-plugins-dev 1.1.22git20091109-1.1ubuntu1.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: frei0r
Description: minimalistic plugin API for video effects
Version: 1.1.22
Libs:
Cflags: -I${includedir}
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