/usr/lib/pkgconfig/flowcanvas.pc is in libflowcanvas-dev 0.7.1+dfsg0-0.2ubuntu2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=/usr/include
Name: flowcanvas
Version: 0.7.1
Description: A Gtkmm canvas widget for graph based interfaces
Requires: libgnomecanvasmm-2.6
Libs: -L${libdir} -lflowcanvas
Cflags: -I${includedir}
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