/usr/lib/pkgconfig/guile-cairo.pc is in guile-cairo-dev 1.4.0-3ubuntu2.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include/guile-cairo
Name: guile-cairo
Description: Cairo binding for Guile Scheme
Version: 1.4.0
Requires: cairo
Libs: -L${libdir} -lguile-cairo
Cflags: -I${includedir}
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