Safe mode + /usr/share/php

Is it possible to use safe mode yet allow all scripts to include any files from /usr/share/php? Normal users ain't gonna have *write* access to that directory, so it shouldn't be much of a security concern, I just don't know how to do this. I know that I can disable safe_mode and enable open_basedir, but that will create yet another security hole because normal users will be able to alter LD_LIBRARY_PATH, which is not a very good idea. AFAIK, they can make PHP load a custom glibc and thus gain root access to the box if I allow them to do that.