/usr/lib/x86_64-linux-gnu/pkgconfig/libcaja-extension.pc is in libcaja-extension-dev 1.8.2-3+deb8u1.
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=/usr/include
extensiondir=${prefix}/lib/x86_64-linux-gnu/caja/extensions-2.0
Name: libcaja-extension
Description: A library to create Caja view extensions
Version: 1.8.2
Requires: glib-2.0 gio-2.0 gtk+-2.0
Libs: -L${libdir} -lcaja-extension
Cflags: -I${includedir}/caja
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