/usr/lib/x86_64-linux-gnu/pkgconfig/cec-platform.pc is in libcec-platform-dev 1.0.10+dfsg1-8.
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
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
DEPENDENCIES=
Name: cec-platform
Description: libCEC Platform support library 1.0
Version: 1.0
Libs: -L${libdir} -lcec-platform
Cflags: -I${includedir}
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