/usr/lib/x86_64-linux-gnu/pkgconfig/libtwin.pc is in libtwin-dev 13.05.03.15.06-g287d16c-2.2.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libtwin
Description: Twin window system library
Version: 0.0.3
Cflags: -I${includedir}
Libs: -L${libdir} -ltwin -lX11 -lpng12 -ljpeg -lz
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