#DPATCHLEVEL=0
Index: linux-user/syscall.c
===================================================================
--- linux-user/syscall.c.orig	2006-11-05 07:07:41.000000000 +0200
+++ linux-user/syscall.c	2006-11-05 07:07:44.000000000 +0200
@@ -33,6 +33,7 @@
 #include <sys/time.h>
 #include <sys/stat.h>
 #include <sys/mount.h>
+#include <sys/prctl.h>
 #include <sys/resource.h>
 #include <sys/mman.h>
 #include <sys/swap.h>
@@ -3486,7 +3487,8 @@ long do_syscall(void *cpu_env, int num, 
     case TARGET_NR_nfsservctl:
         goto unimplemented;
     case TARGET_NR_prctl:
-        goto unimplemented;
+        ret = get_errno(prctl(arg1, arg2, arg3, arg4, arg5));
+        break;
 #ifdef TARGET_NR_pread
     case TARGET_NR_pread:
         page_unprotect_range(arg2, arg3);