libclang1 does not install .so

Ubuntu 12.10, I installed libclang1. However:

    % dpkg -L libclang1|grep '\.so'
    /usr/lib/libclang.so.1

There's no .so file, just .so.1. E.g. the clang_complete Vim plugin can't find the library this way.

If I install libclang-dev:

    % dpkg -L libclang-dev|grep '\.so'
    /usr/lib/libclang.so

Any reason the .so is in the -dev package?

Versions:

    % apt-cache show libclang1|grep '^Version'
    Version: 3.0-6ubuntu3
    % apt-cache show libclang-dev|grep '^Version'
    Version: 3.0-6ubuntu3