Isolate configuration programs on an auxiliary subdirectory.
Add AC_CHECK_FUNCS([regcomp]) to check for the availability of required functions in <regex.h> and update code to optionally rely on it.
Use ::fstat instead of ::stat if a file descriptor is available.
Add -0/--print0 to use the ASCII NUL character (\0) as a line separator.
Update documentation.
Fix record formatting.
Remove the check of having either CoreServices or sys/event.h for fsw to compile.
Remove AC_CANONICAL_HOST.