/usr/lib/x86_64-linux-gnu/pkgconfig/waffle-1.pc is in libwaffle-dev 1.4.0-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: waffle-1
Description: a library for selecting an OpenGL API and window system at runtime
Version: 1.4.0
Libs: -L${libdir} -lwaffle-1
Cflags: -I${includedir}/waffle-1
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