--- uae/src/md-i386-gcc/support.c	2018/04/24 16:42:54	1.1.1.3
+++ uae/src/md-i386-gcc/support.c	2018/04/24 16:48:07	1.1.1.5
@@ -14,6 +14,7 @@
 #include "options.h"
 #include "machdep/m68k.h"
 #include "events.h"
+#include "custom.h"
 
 #ifndef USE_UNDERSCORE
 #define LARGE_ALIGNMENT ".align 16\n"
@@ -237,6 +238,9 @@ static RETSIGTYPE alarmhandler(int foo)
     }
 }
 
+#include <setjmp.h>
+jmp_buf catch_test;
+
 #ifdef __cplusplus
 static RETSIGTYPE illhandler(...)
 #else
@@ -244,14 +248,18 @@ static RETSIGTYPE illhandler(int foo)
 #endif
 {
     rpt_available = 0;
+    longjmp(catch_test,1);
 }
 
 void machdep_init (void)
 {
     rpt_available = 1;
+    fprintf (stderr,"Testing the RDTSC instruction ... ");
     signal (SIGILL, illhandler);
-    read_processor_time ();
+    if (setjmp (catch_test) == 0)
+	read_processor_time ();
     signal (SIGILL, SIG_DFL);
+    fprintf (stderr,"done.\n");
     if (! rpt_available) {
 	fprintf (stderr, "Your processor does not support the RDTSC instruction.\n");
 	return;
@@ -269,7 +277,7 @@ void machdep_init (void)
 	usleep (1000000);
     fprintf (stderr, "ok - %.2f BogoMIPS\n",
 	     ((double)best_time / 1000000), best_time);
-    vsynctime = best_time / 50;
+    syncbase = best_time;
 }
 
 #endif