/usr/lib/pkgconfig/libmsn.pc is in libmsn-dev 4.2.1+dfsg-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 12 | prefix=/usr
exec_prefix=/usr
libdir=/usr/lib
includedir=/usr/include
Name: libmsn
Description: MSN protocol implementation
Version: 0.4.2.1
Requires: libssl
Libs: -L${libdir} -lmsn
Cflags: -I${includedir}
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