/usr/lib/x86_64-linux-gnu/pkgconfig/panelw.pc is in libncursesw5-dev 6.0+20160213-1ubuntu1.
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 14 15 16 17 18 19 | # pkg-config file generated by gen-pkgconfig
# vile:makemode
prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include/ncursesw
abi_version=5
major_version=6
version=6.0.20160213
Name: panelw
Description: ncurses 6.0 add-on library
Version: ${version}
URL: http://invisible-island.net/ncurses
Requires.private: ncursesw
Libs: -L${libdir} -lpanelw
Libs.private:
Cflags: -D_GNU_SOURCE -I${includedir}
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