/usr/lib/x86_64-linux-gnu/pkgconfig/ustr.pc is in libustr-dev 1.0.4-5.
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 | Name: Ustr
Description: String Library
# FIXME: More C&P of VERSION
Version: 1.0.4
Cflags:
Libs: -lustr
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