/usr/lib/x86_64-linux-gnu/pkgconfig/harfbuzz-icu.pc is in libharfbuzz-dev 0.9.35-2.
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 11 12 13 | prefix=/usr
exec_prefix=/usr
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: harfbuzz
Description: HarfBuzz text shaping library ICU integration
Version: 0.9.35
Requires: harfbuzz
Requires.private: icu-uc
Libs: -L${libdir} -lharfbuzz-icu
Cflags: -I${includedir}/harfbuzz
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