/usr/lib/x86_64-linux-gnu/pkgconfig/gtksourceviewmm-3.0.pc is in libgtksourceviewmm-3.0-dev 3.18.0-1.
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 13 14 15 16 17 18 19 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
datarootdir=${prefix}/share
datadir=${datarootdir}
includedir=${prefix}/include
docdir=${datarootdir}/doc/gtksourceviewmm-3.0
doxytagfile=${docdir}/reference/gtksourceviewmm-3.0.tag
htmlrefdir=${docdir}/reference/html
htmlrefpub=http://library.gnome.org/devel/gtksourceviewmm/unstable/
Name: gtksourceviewmm
Description: C++ binding for gtksourceview
Version: 3.18.0
URL: http://projects.gnome.org/gtksourceviewmm/
Requires: glibmm-2.4 >= 2.46.1 gtkmm-3.0 >= 3.18.0 gtksourceview-3.0 >= 3.18.0
Libs: -L${libdir} -lgtksourceviewmm-3.0
Cflags: -I${includedir}/gtksourceviewmm-3.0 -I${libdir}/gtksourceviewmm-3.0/include
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