/usr/lib/pkgconfig/nav_msgs.pc is in libnav-msgs-dev 1.12.5-3.
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 | prefix=/usr
Name: nav_msgs
Description: Description of nav_msgs
Version: 1.12.5
Cflags:
Libs:
Requires: geometry_msgs message_runtime std_msgs actionlib_msgs
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