library links

[Brent Hills]

Why do some libraries have links for the simple to the versioned library
name and some don't?

For example on my system there was no link for /usr/lib/libasound.so to
libasound.so.2.0.0.  Which kept me from compiling a libtheora alpha.

Linking with -lasound for one of the example programs would fail.  Is
there a reason I shouldn't add the link between libasound.so and
libasound.so.2.0.0 (if not why isn't it distributed that way?)

Thanks,
Brent