Usage: fpcsubst-3.0.2 [options] Where options is one or more of -i filename Set input file. Default is standard input -o filename Set output file. Default is standard output. -d name=value define name=value pair. -h show this help and exit. -u name remove name from list of name/value pairs. -l filename read name/value pairs from filename -b show builtin list and exit. -v be verbose. Warning: This utility is deprecated and will be removed from fpc in the future. Please use fpcmkcfg instead.