/usr/lib/x86_64-linux-gnu/pkgconfig/gtksourceview-3.0.pc is in libgtksourceview-3.0-dev 3.22.2-1.
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=${prefix}/include
Name: gtksourceview
Description: Source code editing widget
Version: 3.22.2
Requires: glib-2.0 >= 2.48 gio-2.0 >= 2.48 gtk+-3.0 >= 3.20
Requires.private: libxml-2.0 >= 2.6
Libs: -L${libdir} -lgtksourceview-3.0
Cflags: -I${includedir}/gtksourceview-3.0
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