Recompile/port 'gbsed/libgbsed' utility from Linux/macOS source code 32-bits to 64-bits. 32-bit source code and docs at this link: https://github.com/ask/gbsed (need recompile for Linux/macOS 64-bits gbsed/libgbsed is free software. For documentation, please see the files in the doc subdirectory. For building and installation instructions please see the INSTALL file at https://github.com/ask/gbsed