/usr/lib/pkgconfig/flowcanvas.pc is in libflowcanvas-dev 0.7.1+dfsg0-0.1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=/usr/include
Name: flowcanvas
Version: 0.7.1
Description: A Gtkmm canvas widget for graph based interfaces
Libs: -L${libdir} -lflowcanvas -lgnomecanvasmm-2.6 -lgtkmm-2.4 -lgnomecanvas-2 -latkmm-1.6 -lgdkmm-2.4 -lgiomm-2.4 -lpangomm-1.4 -lglibmm-2.4 -lcairomm-1.0 -lsigc-2.0 -lart_lgpl_2 -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lgmodule-2.0 -lrt -lglib-2.0
Cflags: -I${includedir} -I/usr/include/gtkmm-2.4 -I/usr/lib/x86_64-linux-gnu/gtkmm-2.4/include -I/usr/include/atkmm-1.6 -I/usr/include/giomm-2.4 -I/usr/lib/x86_64-linux-gnu/giomm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/lib/x86_64-linux-gnu/pangomm-1.4/include -I/usr/include/gtk-2.0 -I/usr/include/gtk-unix-print-2.0 -I/usr/include/gdkmm-2.4 -I/usr/lib/x86_64-linux-gnu/gdkmm-2.4/include -I/usr/include/atk-1.0 -I/usr/include/glibmm-2.4 -I/usr/lib/x86_64-linux-gnu/glibmm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/sigc++-2.0 -I/usr/lib/x86_64-linux-gnu/sigc++-2.0/include -I/usr/include/cairomm-1.0 -I/usr/lib/x86_64-linux-gnu/cairomm-1.0/include -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/lib/x86_64-linux-gnu/gtk-2.0/include -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/gail-1.0 -I/usr/include/libgnomecanvasmm-2.6 -I/usr/lib/libgnomecanvasmm-2.6/include -I/usr/include/libgnomecanvas-2.0 -I/usr/include/libart-2.0
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