diff --git a/CMakeLists.txt b/CMakeLists.txt
index e5c5e8d35..8c7a14d8d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,10 +47,6 @@ project (Jerry CXX C ASM)
  add_custom_target(static_check)
  add_dependencies(static_check cppcheck)
 
-# Disable _FORTIFY_SOURCE
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -U_FORTIFY_SOURCE")
- set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -U_FORTIFY_SOURCE")
-
 # Architecture-specific compile/link flags
  foreach(FLAG ${FLAGS_COMMON_ARCH})
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FLAG}")
@@ -77,6 +73,11 @@ project (Jerry CXX C ASM)
 
   option(STRIP_RELEASE_BINARY "Strip symbols from release binaries" OFF)
   set(MCU_SCRIPT_FILE "tests/blinky.js" CACHE STRING "Script to run on MCU")
+ elseif("${PLATFORM}" STREQUAL "EXTERNAL")
+  set(PLATFORM_EXT "EXTERNAL")
+  set(EXTERNAL_BUILD TRUE)
+
+  set(EXTERNAL_LIBC_INTERFACE "UNDEFINED" CACHE STRING "Path to external libc's include directory")
  else()
   message(FATAL_ERROR "Platform is not supported")
  endif()
@@ -85,6 +86,13 @@ project (Jerry CXX C ASM)
  # Script to run on MCU
   set(MCU_SCRIPT_GENERATED_HEADER ${CMAKE_BINARY_DIR}/generated.h)
 
+# Should we use external libc?
+ if(NOT DEFINED EXTERNAL_LIBC_INTERFACE AND NOT EXTERNAL_LIBC_INTERFACE EQUAL "UNDEFINED")
+  set(USE_EXTERNAL_LIBC FALSE)
+ else()
+  set(USE_EXTERNAL_LIBC TRUE)
+ endif()
+
 # Build modes
  # Debug
   set(BUILD_MODE_PREFIX_DEBUG debug)
@@ -225,12 +233,16 @@ project (Jerry CXX C ASM)
  set(SOURCE_JERRY_STANDALONE_MAIN ${SOURCE_JERRY_STANDALONE_MAIN_${PLATFORM_EXT}})
 
 # Component targets
+ # Jerry's libc
+  if(NOT ${USE_EXTERNAL_LIBC})
+   add_subdirectory(jerry-libc)
+  else()
+   set(INCLUDE_LIBC_INTERFACE ${EXTERNAL_LIBC_INTERFACE})
+  endif()
+
  # Jerry's Core
   add_subdirectory(jerry-core)
 
- # Jerry's libc
-  add_subdirectory(jerry-libc)
-
  # Plugins
   add_subdirectory(plugins)
 
@@ -268,6 +280,7 @@ project (Jerry CXX C ASM)
                 PROPERTY LINK_FLAGS "${COMPILE_FLAGS_JERRY} ${CXX_FLAGS_JERRY} ${FLAGS_COMMON_${BUILD_MODE}} ${LINKER_FLAGS_COMMON} ${LINKER_FLAGS_STATIC}")
    target_compile_definitions(${TARGET_NAME} PRIVATE ${DEFINES_JERRY})
    target_include_directories(${TARGET_NAME} PRIVATE ${INCLUDE_CORE_INTERFACE})
+   target_include_directories(${TARGET_NAME} SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
    target_link_libraries(${TARGET_NAME} ${PLUGINS_TARGET_NAME} ${CORE_TARGET_NAME} ${LIBC_TARGET_NAME} ${PREFIX_IMPORTED_LIB}libgcc)
 
    add_cppcheck_target(${TARGET_NAME})
diff --git a/jerry-core/CMakeLists.txt b/jerry-core/CMakeLists.txt
index 70d8a120f..2407afb25 100644
--- a/jerry-core/CMakeLists.txt
+++ b/jerry-core/CMakeLists.txt
@@ -144,6 +144,7 @@ project (JerryCore CXX C ASM)
                 PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_JERRY} ${CXX_FLAGS_JERRY} ${FLAGS_COMMON_${BUILD_MODE}}")
    target_compile_definitions(${TARGET_NAME}.jerry-core PRIVATE ${DEFINES_JERRY})
    target_include_directories(${TARGET_NAME}.jerry-core PRIVATE ${INCLUDE_CORE})
+   target_include_directories(${TARGET_NAME}.jerry-core SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
 
    if("${BUILD_MODE}" STREQUAL "UNITTESTS")
     target_compile_definitions(${TARGET_NAME}.jerry-core INTERFACE ${DEFINES_JERRY})
diff --git a/jerry-core/jrt/jrt-libc-includes.h b/jerry-core/jrt/jrt-libc-includes.h
index b0e2aef7e..f694b52c3 100644
--- a/jerry-core/jrt/jrt-libc-includes.h
+++ b/jerry-core/jrt/jrt-libc-includes.h
@@ -21,33 +21,4 @@
 #include <stdlib.h>
 #include <string.h>
 
-/* Ensuring no macro implementation of functions declared in the headers are used */
-#undef isspace
-#undef isalpha
-#undef islower
-#undef isupper
-#undef isdigit
-#undef isxdigit
-#undef memset
-#undef memcmp
-#undef memcpy
-#undef memmove
-#undef strcmp
-#undef strncmp
-#undef strncpy
-#undef strlen
-#undef putchar
-#undef puts
-#undef exit
-#undef fopen
-#undef rewind
-#undef fclose
-#undef fseek
-#undef ftell
-#undef fread
-#undef fwrite
-#undef vfprintf
-#undef fprintf
-#undef printf
-
 #endif /* !JRT_LIBC_INCLUDES_H */
diff --git a/jerry-libc/CMakeLists.txt b/jerry-libc/CMakeLists.txt
index 94d3929e8..24ef95f7d 100644
--- a/jerry-libc/CMakeLists.txt
+++ b/jerry-libc/CMakeLists.txt
@@ -44,7 +44,9 @@ set(COMPILE_FLAGS_LIBC "${COMPILE_FLAGS_JERRY} ${C_FLAGS_JERRY}")
     set(DEFINES_LIBC_MCU_STM32F4 __TARGET_MCU_STM32F4)
 
 # Include directories
- set(INCLUDE_LIBC .)
+ set(INCLUDE_LIBC ${CMAKE_SOURCE_DIR}/jerry-libc)
+ set(INCLUDE_LIBC_INTERFACE ${CMAKE_SOURCE_DIR}/jerry-libc/include)
+ set(INCLUDE_LIBC_INTERFACE ${INCLUDE_LIBC_INTERFACE} PARENT_SCOPE)
 
  # Platform-specific
   # Linux
@@ -124,6 +126,7 @@ set(COMPILE_FLAGS_LIBC "${COMPILE_FLAGS_JERRY} ${C_FLAGS_JERRY}")
                 PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_LIBC} ${FLAGS_COMMON_${BUILD_MODE}}")
    target_compile_definitions(${TARGET_NAME}.lib PRIVATE ${DEFINES_LIBC})
    target_include_directories(${TARGET_NAME}.lib PRIVATE ${INCLUDE_LIBC})
+   target_include_directories(${TARGET_NAME}.lib SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
    add_dependencies(jerry-libc-all ${TARGET_NAME}.lib)
 
   # Third-party MCU library
@@ -132,6 +135,8 @@ set(COMPILE_FLAGS_LIBC "${COMPILE_FLAGS_JERRY} ${C_FLAGS_JERRY}")
     set_property(TARGET ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB}
                  PROPERTY COMPILE_FLAGS "${FLAGS_COMMON_${BUILD_MODE}}")
     target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} PRIVATE ${INCLUDE_THIRD_PARTY_${PLATFORM_EXT}})
+    target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
+    target_link_libraries(${TARGET_NAME}.lib ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB})
 
     target_link_libraries(${TARGET_NAME}.lib ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB})
    endif()
diff --git a/jerry-libc/include/ctype.h b/jerry-libc/include/ctype.h
new file mode 100644
index 000000000..c7d196b89
--- /dev/null
+++ b/jerry-libc/include/ctype.h
@@ -0,0 +1,32 @@
+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JERRY_LIBC_CTYPE_H
+#define JERRY_LIBC_CTYPE_H
+
+#ifdef __cplusplus
+# define EXTERN_C "C"
+#else /* !__cplusplus */
+# define EXTERN_C
+#endif /* !__cplusplus */
+
+extern EXTERN_C int isxdigit (int c);
+extern EXTERN_C int isalpha (int c);
+extern EXTERN_C int isdigit (int c);
+extern EXTERN_C int islower (int c);
+extern EXTERN_C int isspace (int c);
+extern EXTERN_C int isupper (int c);
+
+#endif /* !JERRY_LIBC_CTYPE_H */
diff --git a/jerry-libc/include/stdio.h b/jerry-libc/include/stdio.h
new file mode 100644
index 000000000..fbef311d1
--- /dev/null
+++ b/jerry-libc/include/stdio.h
@@ -0,0 +1,63 @@
+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JERRY_LIBC_STDIO_H
+#define JERRY_LIBC_STDIO_H
+
+#include <stdarg.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+# define EXTERN_C "C"
+#else /* !__cplusplus */
+# define EXTERN_C
+#endif /* !__cplusplus */
+
+/**
+ * File descriptor type
+ */
+typedef void FILE;
+
+/**
+ * Standard file descriptors
+ */
+extern FILE *stdin;
+extern FILE *stdout;
+extern FILE *stderr;
+
+/**
+ * fseek's 'whence' argument values
+ */
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+/**
+ * I/O routines
+ */
+extern EXTERN_C int vfprintf (FILE *stream, const char *format, va_list ap);
+extern EXTERN_C int puts (const char *s);
+extern EXTERN_C FILE *fopen (const char *path, const char *mode);
+extern EXTERN_C int fclose (FILE *fp);
+extern EXTERN_C size_t fread (void *ptr, size_t size, size_t nmemb, FILE *stream);
+extern EXTERN_C size_t fwrite (const void *ptr, size_t size, size_t nmemb, FILE *stream);
+extern EXTERN_C int fseek (FILE *stream, long offset, int whence);
+extern EXTERN_C long ftell (FILE *stream);
+extern EXTERN_C int printf (const char *format, ...);
+extern EXTERN_C void rewind (FILE *stream);
+extern EXTERN_C int fprintf (FILE *stream, const char *format, ...);
+extern EXTERN_C int putchar (int c);
+
+#endif /* !JERRY_LIBC_STDIO_H */
diff --git a/jerry-libc/include/stdlib.h b/jerry-libc/include/stdlib.h
new file mode 100644
index 000000000..c88e5a765
--- /dev/null
+++ b/jerry-libc/include/stdlib.h
@@ -0,0 +1,27 @@
+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JERRY_LIBC_STDLIB_H
+#define JERRY_LIBC_STDLIB_H
+
+#ifdef __cplusplus
+# define EXTERN_C "C"
+#else /* !__cplusplus */
+# define EXTERN_C
+#endif /* !__cplusplus */
+
+extern EXTERN_C void __attribute__ ((noreturn)) exit (int);
+
+#endif /* !JERRY_LIBC_STDLIB_H */
diff --git a/jerry-libc/include/string.h b/jerry-libc/include/string.h
new file mode 100644
index 000000000..5d3d6cd78
--- /dev/null
+++ b/jerry-libc/include/string.h
@@ -0,0 +1,36 @@
+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JERRY_LIBC_STRING_H
+#define JERRY_LIBC_STRING_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+# define EXTERN_C "C"
+#else /* !__cplusplus */
+# define EXTERN_C
+#endif /* !__cplusplus */
+
+extern EXTERN_C int    memcmp (const void *s1, const void *s2, size_t n);
+extern EXTERN_C void*  memcpy (void *dest, const void *src, size_t n);
+extern EXTERN_C void*  memset (void *s, int c, size_t n);
+extern EXTERN_C int    strcmp (const char *s1, const char *s2);
+extern EXTERN_C size_t strlen (const char *s);
+extern EXTERN_C void*  memmove (void *dest, const void *src, size_t n);
+extern EXTERN_C int    strncmp (const char *s1, const char *s2, size_t n);
+extern EXTERN_C char*  strncpy (char *dest, const char *src, size_t n);
+
+#endif /* !JERRY_LIBC_STRING_H */
diff --git a/jerry-libc/jerry-libc-defs.h b/jerry-libc/jerry-libc-defs.h
index 08f0106d1..a3ed58950 100644
--- a/jerry-libc/jerry-libc-defs.h
+++ b/jerry-libc/jerry-libc-defs.h
@@ -19,7 +19,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stddef.h>
-#include <stdlib.h>
 
 /**
  * Attributes
@@ -69,49 +68,10 @@ libc_fatal (const char *msg,
  * but referenced from third-party libraries.
  */
 #define LIBC_UNREACHABLE_STUB_FOR(...) \
+extern __VA_ARGS__; \
 __attr_used___ __VA_ARGS__ \
 { \
   LIBC_UNREACHABLE (); \
 }
 
-/**
- * Libc redefinitions
- */
-
-/* Ensuring no macro implementation of variables / functions are in effect */
-#undef vfprintf
-#undef fprintf
-#undef printf
-#undef isspace
-#undef isalpha
-#undef islower
-#undef isupper
-#undef isdigit
-#undef isxdigit
-#undef memset
-#undef memcmp
-#undef memcpy
-#undef memmove
-#undef strcmp
-#undef strncmp
-#undef strncpy
-#undef strlen
-#undef putchar
-#undef puts
-#undef exit
-#undef fopen
-#undef rewind
-#undef fclose
-#undef fseek
-#undef ftell
-#undef fread
-#undef fwrite
-#undef stdin
-#undef stdout
-#undef stderr
-
-extern FILE* stdin;
-extern FILE* stdout;
-extern FILE* stderr;
-
 #endif /* !DEFS_H */
diff --git a/jerry-libc/jerry-libc-fatals.c b/jerry-libc/jerry-libc-fatals.c
index 8b4e6edbe..eb2f11c7f 100644
--- a/jerry-libc/jerry-libc-fatals.c
+++ b/jerry-libc/jerry-libc-fatals.c
@@ -18,6 +18,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "jerry-libc-defs.h"
 
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index abc477c4b..6d1317dcd 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -99,6 +99,7 @@ project (Jerry_Plugins CXX ASM)
                 PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_PLUGINS} ${FLAGS_COMMON_${BUILD_MODE}}")
    target_compile_definitions(${TARGET_NAME}.lib PRIVATE ${DEFINES_PLUGINS})
    target_include_directories(${TARGET_NAME}.lib PRIVATE ${INCLUDE_PLUGINS} ${INCLUDE_CORE_INTERFACE})
+   target_include_directories(${TARGET_NAME}.lib SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
    add_dependencies(plugins-all ${TARGET_NAME}.lib)
 
   # Third-party MCU library
@@ -107,6 +108,7 @@ project (Jerry_Plugins CXX ASM)
     set_property(TARGET ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB}
                  PROPERTY COMPILE_FLAGS "${FLAGS_COMMON_${BUILD_MODE}}")
     target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} PRIVATE ${INCLUDE_PLUGINS})
+    target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
 
     target_link_libraries(${TARGET_NAME}.lib ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB})
    endif()