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diff --git a/CMakeLists.txt b/CMakeLists.txt
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+# CMake build system for mruby
+# License: released under the same license as mruby
+# Author: [email protected]
+# Author: [email protected]
+#
+# Usage example:
+#   1. Ensure CMake, Bison, and a build toolchain are on `PATH`
+#   2. Change to a build directory outside source tree, eg - `build` subdir
+#   3. Create build Makefiles or project files.
+#        `cmake ..`  (UNIX-like system)
+#        `cmake -G "MSYS Makefiles" ..`
+#        `cmake -G "Visual Studio 10" ..`
+#        `cmake -G "NMake Makefiles" ..`
+#      ** to cross-compile: add -DCMAKE_TOOLCHAIN_FILE=/path/to/toolchain/file
+#      ** to set install dir: add -DCMAKE_INSTALL_PREFIX=/path/to/installdir
+#  4a. Build: `make`  (to make noisy, add `VERBOSE=1`)
+#  4b. Build and test: `make all test`
+#  4c. Build, test, and install: `make all test install`
+#  4d. Build, test, and package: `make all test package`
+
+cmake_minimum_required(VERSION 2.8.8 FATAL_ERROR)
+
+# Default build mode is Release With Debug Info unless specified
+if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
+      "Choose build type: empty Debug Release RelWithDebInfo MinSizeRel"
+      FORCE)
+  message(STATUS "Build type not set, defaulting to 'RelWithDebInfo'")
+endif()
+
+project(mruby C)
+
+# TODO stop polluting source tree with CMakeFiles/ and CMakeCache.txt
+#      on build location check failure
+# Make sure we are not trying to generate in in-tree build unless building
+# with a MSVC IDE where it's OK.
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE)
+  message(FATAL_ERROR
+          "\nIn-source builds are not allowed as CMake would overwrite the "
+          "Makefiles distributed with mruby. Please change to the 'build' "
+          "subdirectory and run CMake from there.")
+endif()
+
+if(COMMAND cmake_policy)
+  cmake_policy(SET CMP0003 NEW)  # don't split absolute link paths
+  cmake_policy(SET CMP0012 NEW)  # recognize number & boolean literals
+  cmake_policy(SET CMP0015 NEW)  # convert relative link paths to absolute
+endif(COMMAND cmake_policy)
+
+# Match original Makefile's default in-tree install.
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX ${CMAKE_SOURCE_DIR} CACHE PATH
+    "Install path prefix prepended to install directories."
+    FORCE
+    )
+endif()
+
+# TODO refactor to use an option when adding shared lib support
+set(BUILD_SHARED_LIBS OFF)
+
+# Version of mruby, useful for versoning .so and .dll files.
+# TODO automate by parsing src/version.h -or- extract git info?
+set(MRUBY_VERSION 1.0.0dev)
+string(REGEX MATCH "^[0-9]+[.][0-9]+" MRUBY_SOVERSION ${MRUBY_VERSION})
+string(REPLACE "." "" MRUBY_DLL_SHORTVER ${MRUBY_SOVERSION})
+
+# Search in the `cmake` directory for custom CMake helper modules.
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
+include(IntrospectSystem)
+
+# Search for C header files in these directories.
+include_directories("${CMAKE_SOURCE_DIR}/include" "${CMAKE_SOURCE_DIR}/src")
+
+# TODO re-enable (and implement) if needed
+# On some 64-bit platforms, libraries should be installed into `lib64'
+# instead of `lib'.  Set this to 64 to do that.
+#set(LIB_SUFFIX "" CACHE STRING "Suffix for 'lib' directories, e.g. '64'")
+
+# build the components
+add_subdirectory(src)
+add_subdirectory(mrblib)
+add_subdirectory(tools)
+add_subdirectory(test)
+
+# install the header files
+install(FILES include/mruby.h DESTINATION include)
+install(FILES include/mrbconf.h DESTINATION include)
+install(DIRECTORY include/mruby DESTINATION include FILES_MATCHING PATTERN "*.h")
+
+# TODO refactor once proper versioning scheme implemented
+# archive packaging
+set(CPACK_GENERATOR "TGZ;ZIP")
+string(TOLOWER ${CMAKE_SYSTEM_NAME} MRUBY_HOST)
+if(CMAKE_C_COMPILER_VERSION)
+  string(REPLACE "." "" MRUBY_GCC_VERSION ${CMAKE_C_COMPILER_VERSION})
+endif()
+
+# TODO add build info suffix for non-Windows builds?
+if(MINGW)
+  set(MRUBY_BUILD "-mingw${MRUBY_GCC_VERSION}")
+elseif(MSVC)
+  set(MRUBY_BUILD "-msvc${MSVC_VERSION}")
+endif()
+set(CPACK_PACKAGE_FILE_NAME
+  "${CMAKE_PROJECT_NAME}-${MRUBY_VERSION}-${MRUBY_HOST}${MRUBY_BUILD}"
+  )
+include(CPack)
+
+# vim: ts=2 sts=2 sw=2 et