Remove duplicate `|| defined(SVR4)' disjunct guarding the
#define KERNEL_FILE "/unix" definiton.
#define decstation
#endif
+#if defined (__SVR4) && !defined (SVR4)
+#define SVR4
+#endif
+
#if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
#define SUNOS_5
#endif
#define KERNEL_FILE "/hp-ux"
#endif
-#if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
+#if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
#define KERNEL_FILE "/unix"
#endif