pokeemerald/INSTALL.md

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Follow the OS-specific instructions below.
# 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_POKEEMERALD_DIRECTORY
```
Then in the pokeemerald 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 pokeemerald directory.
You can then build pokeemerald using `make` in the MSYS environment provided with devkitARM.
# Mac
Installing pokeemerald on a Mac requires macOS >= 10.12 (Sierra or higher).
Download a [devkitPRO pacman](https://github.com/devkitPro/pacman/releases/tag/v1.0.0)
Run the following commands in Terminal:
```
xcode-select --install
sudo dkp-pacman -S devkitARM
export DEVKITPRO=/opt/devkitpro
echo "export DEVKITPRO=$DEVKITPRO" >> ~/.bashrc
export DEVKITARM=$DEVKITPRO/devkitARM
echo "export DEVKITARM=$DEVKITARM" >> ~/.bashrc
echo "if [ -f ~/.bashrc ]; then . ~/.bashrc; fi" >> ~/.bash_profile
git clone https://github.com/pret/pokeemerald
git clone https://github.com/pret/agbcc
cd agbcc/
./build.sh
./install.sh ../pokeemerald
cd ../pokeemerald
./build_tools.sh
```
And build the ROM with `make`.
# Faster builds
After the first build, subsequent builds are faster. You can further speed up the build:
## Parallel build
This significantly speeds up the build on modern machines.
By default `make` only runs a single thread. You can tell `make` to run on multiple threads with `make -j`. See the manfile for usage (`man make`).
The optimal value for `-j` is the number of logical cores on your machine. You can run `nproc` to see the exact number.
```
$ nproc
8
```
If you have 8 cores, run: `make -j8`
`-j` on its own will spawn a new thread for each job. A clean build will have thousands of jobs, which will be slower than not using -j at all.
## Disable the dependency scanning
If you've only changed `.c` or `.s` files, you can turn off the dependency scanning temporarily. Changes to any other files will be ignored, and the build will either fail or not reflect those changes.
`make NODEP=1`