--- swipl-9.2.9/packages/xpce/src/ker/self.c.orig
+++ swipl-9.2.9/packages/xpce/src/ker/self.c
@@ -57,10 +57,6 @@
 #define OS ws_os()
 #endif
 
-#if (defined(__sun__) && !STDC_HEADERS)
-extern int gethostname(char *__name, size_t __len);
-#endif
-
 static void	callExitMessagesPce(int stat, Pce pce);
 static void	exit_pce(int);
 #ifdef HAVE_ON_EXIT