/usr/lib/x86_64-linux-gnu/pkgconfig/oniguruma.pc is in libonig-dev 5.9.5-3.2+deb8u1.
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
datarootdir=/usr/share
datadir=/usr/share
Name: oniguruma
Description: Regular expression library
Version: 5.9.5
Requires:
Libs: -L${libdir} -lonig
Cflags: -I${includedir}
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