diff --git a/cf/sunos5-5.h b/cf/sunos5-5.h
index ea842a62..e7cdea62 100644
--- a/cf/sunos5-5.h
+++ b/cf/sunos5-5.h
@@ -85,7 +85,7 @@ extern int h_errno;
 #define _PATH_DHCPD_PID	"/etc/dhcpd.pid"
 #endif
 
-#ifdef __GNUC__
+#if defined (__GNUC__) || defined (__SVR4)
 /* Varargs stuff: use stdarg.h instead ... */
 #include <stdarg.h>
 #define VA_DOTDOTDOT ...
@@ -120,3 +120,5 @@ extern int h_errno;
 
 #define TIME time_t
 #define GET_TIME(x)	time ((x))
+
+#define random()	rand()
diff --git a/includes/cf/sunos5-5.h b/includes/cf/sunos5-5.h
index ea842a62..e7cdea62 100644
--- a/includes/cf/sunos5-5.h
+++ b/includes/cf/sunos5-5.h
@@ -85,7 +85,7 @@ extern int h_errno;
 #define _PATH_DHCPD_PID	"/etc/dhcpd.pid"
 #endif
 
-#ifdef __GNUC__
+#if defined (__GNUC__) || defined (__SVR4)
 /* Varargs stuff: use stdarg.h instead ... */
 #include <stdarg.h>
 #define VA_DOTDOTDOT ...
@@ -120,3 +120,5 @@ extern int h_errno;
 
 #define TIME time_t
 #define GET_TIME(x)	time ((x))
+
+#define random()	rand()
diff --git a/includes/osdep.h b/includes/osdep.h
index f0893370..02af9dcd 100644
--- a/includes/osdep.h
+++ b/includes/osdep.h
@@ -62,7 +62,7 @@
    If you add a new system configuration file, include it here: */
 
 #if defined (sun)
-# if defined (__svr4__)
+# if defined (__svr4__) || defined (__SVR4)
 #  include "cf/sunos5-5.h"
 # else
 #  include "cf/sunos4.h"
diff --git a/osdep.h b/osdep.h
index f0893370..02af9dcd 100644
--- a/osdep.h
+++ b/osdep.h
@@ -62,7 +62,7 @@
    If you add a new system configuration file, include it here: */
 
 #if defined (sun)
-# if defined (__svr4__)
+# if defined (__svr4__) || defined (__SVR4)
 #  include "cf/sunos5-5.h"
 # else
 #  include "cf/sunos4.h"