Instructions on building and installing GPTL are contained in the file INSTALL contained in this same directory. Usage descriptions and examples can be found in the man pages, and web pages living at github (https://jmrosinski.github.io/GPTL) and in the doc/ subdirectory here. GPTL was written and is maintained by Jim Rosinski (jmrosinski AT gmail DOT com). Feel free to email me with questions, bugs, or feature requests. If you have code to contribute, you can issue a PR at the GPTL github address mentioned above.