/usr/lib/pkgconfig/adplug.pc is in libadplug-dev 2.2.1+dfsg3-0.1ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: adplug
Description: A free AdLib sound player library
URL: http://adplug.sourceforge.net
Version: 2.2.1
Requires: libbinio >= 1.4
Libs: -L${libdir} -ladplug
CFlags: -I${includedir}
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