options. From Dave Love <d.love@dl.ac.uk>.
#include "osf1.h"
/* It's enough to define _OSF_SOURCE instead of _BSD. */
+
+/* -nointrinsics is required to avoid losing with definitions of POSIX
+ stuff in regex.c, for instance, where regex_t isn't consistent
+ with the system defintion. This may be necessary also on OSF 4
+ systems with dtk 6.4 installed. */
#undef C_SWITCH_SYSTEM
+#ifdef __GNUC__
#define C_SWITCH_SYSTEM -D_OSF_SOURCE
+#else
+#define C_SWITCH_SYSTEM -D_OSF_SOURCE -nointrinsics
+#endif
#define WAIT_USE_INT
#define SYS_SIGLIST_DECLARED