Don't define.
(GC_SETJMP_WORKS, GC_MARK_STACK): Define.
#undef C_SWITCH_SYSTEM
#define C_SWITCH_SYSTEM -D_OSF_SOURCE
-#define WAIT_USE_INT
-#define SYS_SIGLIST_DECLARED
-#define sys_siglist __sys_siglist
#ifndef NSIG /* _OSF_SOURCE seems to get us this */
#define NSIG __sys_nsig
#endif
#define TERMINFO
#define LIBS_TERMCAP -lcurses
+
+#define GC_SETJMP_WORKS 1
+#define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS