[__GNUC__] (C_SWITCH_SYSTEM): Add #undef.
/* j.w.hawtin@lut.ac.uk says Solaris 2.1 on the X86 needs -lkvm, and it
already has FSCALE defined in a system header. */
#define LIBS_MACHINE -lkvm
+
+/* 14/9/84 J.W.Hawtin@lut.ac.uk Solaris 2.1 X86 does not like -traditional
+ with GCC on the C_SWITCH_SYSTEM flags. */
+#ifdef __GNUC__
+#undef C_SWITCH_SYSTEM
+#endif /* GCC */
+#define HAVE_VFORK
+
#endif
/* configure thinks solaris X86 has gethostname, but it does not work,