/usr/lib/pkgconfig/gnash.pc is in gnash-dev 0.8.11~git20160109-1build1.
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/gnash
includedir=${prefix}/include/gnash/
Name: Gnash
Description: Flash (shockwave) player
Version: 0.8.11dev
Libs: -L${libdir} -lgnashcore
Cflags: -I${includedir}
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