B.1.3.1 SPARC: The SunOS/BSD Source Compatibility Package

If this software package is installed, it supports some of the SunOS/BSD commands that are not included in, or have changed in, the SunOS 5.x system software. Application source code that is compliant with the SunOS 4.x environment will compile and run under the Solaris 2.5 environment by using the SunOS/BSD Source Compatibility package.

For specific details, see Binary Compatibility Guide and Source Installation and Media Preparation Guide.