/usr/lib/x86_64-linux-gnu/pkgconfig/libopenmpt.pc is in libopenmpt-dev 0.2.7386~beta20.3-3+deb9u3.
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=${prefix}
includedir=${prefix}/include
libdir=${prefix}/lib/x86_64-linux-gnu
Name: libopenmpt
Description: Tracker module player based on OpenMPT
Version: 0.2.7386-autotools
Requires.private: zlib libmpg123 ogg vorbis vorbisfile
Libs: -L${libdir} -lopenmpt
Libs.private:
Cflags: -I${includedir}
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