5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/abort.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 Some platforms mistakenly close all stdio streams prior to raising
21 Some platforms always print a message to stderr, even if a SIGABRT handler
22 uses longjmp to resume execution at a safe point: