/usr/lib/x86_64-linux-gnu/pkgconfig/panelw.pc is in libncursesw5-dev 5.9-4.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include/ncursesw
major_version=5
version=5.9.20110404
Name: panelw
Description: ncurses 5.9 add-on library
Version: ${version}
Requires: ncursesw tinfo
Libs: -L${libdir} -lpanelw
Cflags: -I${includedir}
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