The Heirloom Bourne Shell is a portable variant of the traditional Unix shell. It is especially suitable for testing the portability of shell scripts and for processing legacy scripts. The Bourne shell does not provide as many features as newer Unix shells, but it does provide a stable shell language. With this in mind, it is also suitable for general script processing and interactive use. This variant of the Bourne shell has been derived from OpenSolaris code and thus provides the SVR4/SVID3 level of the shell.
smake is a highly portable 'make' program that makes commands up to date based on rules in Makefiles and on the timestamps of the related files. It implements a complete superset of the features of the classical POSIX/Unix make program. It warns about typical misuse of dynamic macros that prevent portability of makefiles. Its automake features allow you to run scripts to automatically create rules for unknown platforms.