/usr/lib/x86_64-linux-gnu/pkgconfig/libt3window.pc is in libt3window-dev 0.3.0-1build2.
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 11 12 | prefix=/usr
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libt3window
Description: Terminal windowing library
Version: 0.3.0
URL: http://os.ghalkes.nl/t3/libt3window.html
Requires.private: tinfo, libtranscript >= 0.2.2
Libs: -L${libdir} -lt3window
Libs.private: -lunistring
Cflags: -I${includedir}/t3/window
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