/usr/lib/pkgconfig/unac.pc is in libunac1-dev 1.8.0-6.
This file is owned by root:root, with mode 0o644.
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# pkg-config(1) specification file for http://www.senga.org/unac/
#
prefix=/usr
exec_prefix=/usr
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: unac
Description: A C programmer's library that removes accents from a string.
Version: 1.8.0
Libs: -L${libdir} -lunac
Cflags: -I${includedir}
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