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+# Linux
+
+Install [**devkitARM**](http://devkitpro.org/wiki/Getting_Started/devkitARM).
+
+Make sure that there is an environment variable called DEVKITARM with the path of the directory before the "bin" directory containing "arm-none-eabi-as", "arm-none-eabi-cpp", "arm-none-eabi-ld" and "arm-none-eabi-objcopy".
+
+Then get the compiler from https://github.com/pret/agbcc and run the following commands.
+
+	build.sh
+	install.sh PATH_OF_PMD-RED_DIRECTORY
+	${DEVKITARM}/bin/arm-none-eabi/ranlib PATH_OF_PMD-RED_DIRECTORY/tools/agbcc/lib/libgcc.a lib/libc.a
+
+Then in the pokeruby directory, build the tools.
+
+	build_tools.sh
+
+Finally, build the rom.
+
+	make
+
+# Windows
+
+Install [**devkitARM**](http://devkitpro.org/wiki/Getting_Started/devkitARM).
+
+Then get the compiled tools from https://github.com/pret/pokeruby-tools. Copy the `tools/` folder over the `tools/` folder in your pokeruby directory.
+
+You can then build pokeruby using `make` in the MSYS environment provided with devkitARM.