/usr/lib/pkgconfig/libcw.pc is in libcw3-dev 3.0.2-1.
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 | prefix=/usr
exec_prefix=/usr
libdir=/usr/lib
includedir=/usr/include
Name: libcw
Description: CW (Morse code) library.
Version: 3.0.1
Requires: alsa
Libs: -L${libdir} -lcw -lpthread -lm
Cflags: -I${includedir}
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