/usr/lib/x86_64-linux-gnu/pkgconfig/libMUSCLE-3.7.pc is in libmuscle-3.7-dev 3.7+4565-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libMUSCLE
Description: The MUSCLE multiple sequence alignment code turned into a library
Version: 1.0.0
Libs: -L${libdir} -lMUSCLE-3.7
Cflags: -I${includedir}/libMUSCLE-3.7
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