/usr/lib/x86_64-linux-gnu/pkgconfig/libdlm.pc is in libdlm-dev 4.0.7-1ubuntu2.
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=${prefix}
includedir=${prefix}/include
libdir=/usr//lib64
Name: libdlm
Description: The dlm library
Version: 4.0.0
Cflags: -I${includedir}
Libs: -L${libdir} -ldlm -lpthread
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