...
While Shibboleth now supports 64-bit builds, Solaris quite logically limits the use of 64-bit code to applications where it provides clear benefits. Apache and Shibboleth are not such a case. The Apache software provided by Sun on new Solaris versions is 32-bit and requires that Shibboleth be 32-bit as well. As a result, the packages provided for Solaris 10 are 32-bit and should work on either 32-or 64-bit Solaris 10.
...