/usr/lib/x86_64-linux-gnu/pkgconfig/ILUT.pc is in libdevil-dev 1.7.8-10+b2.
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 | prefix=/usr
exec_prefix=${prefix}
Name: ILUT
Description: Developer's Image Library - ILUT part (connection to higher level libraries)
Version: 1.7.8
URL: http://openil.sourceforge.net
Libs: -L${prefix}/lib/x86_64-linux-gnu -lILUT -ILU -lIL
Libs.private: -lXrender -lXext -lX11 -L/usr/lib/x86_64-linux-gnu -lSDL -lGLU -lGL -lm -lGL -lm -lalleg
Cflags: -I${prefix}/include
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