libsbuf is an implementation of the FreeBSD safe string composition functions for OS X.
The source code is based on the source of FreeBSD 11.
To build the library, simply run ./build from the root directory of the project. This produces all output in the output subdirectory.
To install the library, first build it, then run ./install as superuser from the root directory of the project. This will install the library under the default prefix directory /usr/local.
A custom prefix directory can be specified by setting the INSTALL_PREFIX environment variable before installing.
The manual page for the API is sbuf(3).