/usr/lib/x86_64-linux-gnu/pkgconfig/igraph.pc is in libigraph0-dev 0.7.1-2.1build2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libigraph
Description: A library for creating and manipulating graphs
Version: 0.7.1
URL: http://igraph.org
Libs: -L${libdir} -ligraph
Libs.private: -lxml2 -lz -lm -lgmp -lblas -llapack -larpack -lglpk
Cflags: -I${includedir}/igraph
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