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If you are migrating to UNIX® System V from a BSD System environment, or want to run BSD system applications, you may need to install and access the BSD libraries and header files included in the BSD Compatibility Package.
Once the BSD Compatibility Package is installed, compatibility package header files and libraries called by the C compiler (cc) and linker (ld) are located in /usr/ucbinclude and /usr/ucblib. To access these header files and libraries, set your PATH variable so that /usr/ucb comes before the default UNIX® System V path directories /sbin, /usr/sbin, /usr/bin, and /usr/ccs/bin.
For more information on the BSD application compatibility, see Appendix B of Programming with System Calls and Libraries.