It is also used to generate Zenwalk style depfiles.
It uses "ldd" and /var/log/packages to find and solve dependency problems, besides it also adds dependencies for script files using che command "file".
From 0.11.0 requiredbuilder is also able to search for perl dependencies.
It's distributed under the GPL and developed in bash.
RequiredBuilder 0.16.5 sources
RequiredBuilder 0.16.5 Slackware package