HAVE_SIGALTSTACK   54 maint/gnulib/lib/sigaction.c #if defined SIGCHLD || defined HAVE_SIGALTSTACK || defined HAVE_SIGINTERRUPT
HAVE_SIGALTSTACK 1257 maint/gnulib/lib/sigsegv.c # if HAVE_STACK_OVERFLOW_RECOVERY && HAVE_SIGALTSTACK /* not BeOS */