diff --git a/arch/sim/src/Makefile b/arch/sim/src/Makefile
index 040a9841d72..cd51e047a64 100644
--- a/arch/sim/src/Makefile
+++ b/arch/sim/src/Makefile
@@ -94,8 +94,11 @@ libarch$(LIBEXT): $(NXOBJS)
 # A partially linked object containing only NuttX code (no interface to host OS)
 # Change the names of most symbols that conflict with libc symbols.
 
-Linux-names.dat: nuttx-names.dat
-	@cp $^ $@
+GNU:
+	@mkdir ./GNU
+
+GNU/Linux-names.dat: GNU nuttx-names.dat
+	@cp nuttx-names.dat $@
 
 Cygwin-names.dat: nuttx-names.dat
 	@cat $^ | sed -e "s/^/_/g" >$@
diff --git a/arch/sim/src/up_blockdevice.c b/arch/sim/src/up_blockdevice.c
index 243d8215f95..1146e418241 100644
--- a/arch/sim/src/up_blockdevice.c
+++ b/arch/sim/src/up_blockdevice.c
@@ -83,5 +83,5 @@
 
 void up_registerblockdevice(void)
 {
-  rd_register(0, up_deviceimage(), NSECTORS, LOGICAL_SECTOR_SIZE, TRUE);
+  rd_register(0, (ubyte*)up_deviceimage(), NSECTORS, LOGICAL_SECTOR_SIZE, TRUE);
 }
diff --git a/arch/sim/src/up_initialize.c b/arch/sim/src/up_initialize.c
index 4f639a88b65..fcfe9d24b0c 100644
--- a/arch/sim/src/up_initialize.c
+++ b/arch/sim/src/up_initialize.c
@@ -81,6 +81,15 @@
 
 void up_initialize(void)
 {
+  /* The real purpose of the following is to make sure that lib_rawprintf
+   * is drawn into the link.  It is needed by up_tapdev which is linked
+   * separately.
+   */
+
+#ifdef CONFIG_NET
+  lib_rawprintf("SIM: Initializing");
+#endif
+
   /* Register devices */
 
   devnull_register();       /* Standard /dev/null */
diff --git a/arch/sim/src/up_uipdriver.c b/arch/sim/src/up_uipdriver.c
index a035d753cb3..24f8f204eca 100644
--- a/arch/sim/src/up_uipdriver.c
+++ b/arch/sim/src/up_uipdriver.c
@@ -138,8 +138,6 @@ static int sim_uiptxpoll(struct uip_driver_s *dev)
 
 void uipdriver_loop(void)
 {
-  int i;
-
   /* tapdev_read will return 0 on a timeout event and >0 on a data received event */
 
   g_sim_dev.d_len = tapdev_read((unsigned char*)g_sim_dev.d_buf, CONFIG_NET_BUFSIZE);