Architecture independent -dev package

["Shaun Jackman" <sjackman@gmail.com>]

If a -dev package is architecture independent -- for example contains
only a symlink from the .so to the .so.X file and possibly a .pc file
-- what's the best dependency on the libfooX package, keeping in mind
binnmuability?

Depends: libfooX (>= ${source:Version}), libfooX (<< ${source:Version}.1~)

as suggested by lintian seems to me to be the best choice. Just to be
clear, libfoo-dev is Architecture: all and libfooX is Architecture:
any.

Cheers,
Shaun