diff --git a/Makefile b/Makefile
index c62cf9983f..56b7068910 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 
 export CC ?= gcc
 export CXX ?= g++
-export CFLAGS = -Wall -DNDEBUG -O3 -Werror
+export CFLAGS = -Wall -DNDEBUG -O3 -Werror -DCHROMEOS_ENVIRONMENT
 export TOP = $(shell pwd)
 export FWDIR=$(TOP)/firmware
 export HOSTDIR=$(TOP)/host
diff --git a/firmware/include/sysincludes.h b/firmware/include/sysincludes.h
index 758e5820a2..13c0914a84 100644
--- a/firmware/include/sysincludes.h
+++ b/firmware/include/sysincludes.h
@@ -15,6 +15,8 @@
 #ifndef VBOOT_REFERENCE_SYSINCLUDES_H_
 #define VBOOT_REFERENCE_SYSINCLUDES_H_
 
+#ifdef CHROMEOS_ENVIRONMENT
+
 #include <inttypes.h>  /* For PRIu64 */
 #include <stdint.h>
 #include <stdlib.h>
@@ -24,5 +26,8 @@
 #include <memory.h>
 #endif
 
+#else
+#include "stub/biosincludes.h"
+#endif
 
 #endif  /* VBOOT_REFERENCE_SYSINCLUDES_H_ */
diff --git a/firmware/stub/biosincludes.h b/firmware/stub/biosincludes.h
new file mode 100644
index 0000000000..9ed4eaba15
--- /dev/null
+++ b/firmware/stub/biosincludes.h
@@ -0,0 +1,14 @@
+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef CHROMEOS_SRC_PLATFORM_VBOOT_REFERENCE_FIRMWARE_STUB_BIOSINCLUDES_H_
+#define CHROMEOS_SRC_PLATFORM_VBOOT_REFERENCE_FIRMWARE_STUB_BIOSINCLUDES_H_
+
+/*
+ * This file is a placeholder for the includes supplied by the BIOS
+ * compilation environment. This file is included if and only if
+ * CHROMEOS_ENVIRONMENT is not defined at compilation time.
+ */
+
+#endif /*CHROMEOS_SRC_PLATFORM_VBOOT_REFERENCE_FIRMWARE_STUB_BIOSINCLUDES_H_*/