diff --git a/arch/avr/include/avr/types.h b/arch/avr/include/avr/types.h
index 2dd35a5cb26..e0a70fb7f94 100644
--- a/arch/avr/include/avr/types.h
+++ b/arch/avr/include/avr/types.h
@@ -76,11 +76,16 @@ typedef signed long long   _int64_t;   /* long long is 64-bits */
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
-/* A pointer is 2 bytes */
+/* A (near) pointer is 2 bytes */
 
 typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
+/* A FAR pointer is 4 bytes */
+
+typedef signed long        _int_farptr_t;
+typedef unsigned long      _uint_farptr_t;
+
 /* This is the size of the interrupt state save returned by irqsave(). */
 
 typedef unsigned char      irqstate_t;
diff --git a/arch/avr/src/at90usb/Make.defs b/arch/avr/src/at90usb/Make.defs
index 5b939f5afc1..0497acd9504 100644
--- a/arch/avr/src/at90usb/Make.defs
+++ b/arch/avr/src/at90usb/Make.defs
@@ -62,6 +62,10 @@ ifeq ($(CONFIG_DEBUG_STACK),y)
 CMN_CSRCS	+= up_checkstack.c
 endif
 
+ifeq ($(CONFIG_ARCH_ROMGETC),y)
+CMN_CSRCS	+= up_romgetc.c
+endif
+
 # Required AT90USB files
 
 CHIP_ASRCS	= at90usb_exceptions.S
diff --git a/arch/avr/src/atmega/Make.defs b/arch/avr/src/atmega/Make.defs
index 47683fcd083..b3451aaa1f4 100644
--- a/arch/avr/src/atmega/Make.defs
+++ b/arch/avr/src/atmega/Make.defs
@@ -62,6 +62,10 @@ ifeq ($(CONFIG_DEBUG_STACK),y)
 CMN_CSRCS	+= up_checkstack.c
 endif
 
+ifeq ($(CONFIG_ARCH_ROMGETC),y)
+CMN_CSRCS	+= up_romgetc.c
+endif
+
 # Required ATMEGA files
 
 CHIP_ASRCS	= atmega_exceptions.S
diff --git a/arch/sim/src/Makefile b/arch/sim/src/Makefile
index 8e2fc56de97..f32f17b010e 100644
--- a/arch/sim/src/Makefile
+++ b/arch/sim/src/Makefile
@@ -64,9 +64,15 @@ HOSTSRCS = up_stdio.c up_hostusleep.c
 ifeq ($(USEX),y)
   HOSTSRCS +=  up_x11framebuffer.c
 endif
+
 ifeq ($(CONFIG_FS_FAT),y)
 CSRCS += up_blockdevice.c up_deviceimage.c
 endif
+
+ifeq ($(CONFIG_ARCH_ROMGETC),y)
+CSRCS += up_romgetc.c
+endif
+
 ifeq ($(CONFIG_NET),y)
 CSRCS += up_uipdriver.c
 HOSTCFLAGS += -DNETDEV_BUFSIZE=$(CONFIG_NET_BUFSIZE)