Add the start of a simple ports infrastructure

Ports/.port_include.sh

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+#!/bin/sh
+
+# This script contains common helpers for all ports.
+set -e
+
+if [ -z "$MAKEOPTS" ]; then
+    MAKEOPTS="-j $(nproc)"
+fi
+if [ -z "$INSTALLOPTS" ]; then
+    MAKEOPTS="-j $(nproc)"
+fi
+if [ -z "$SERENITY_ROOT" ]; then
+    echo "You must have source'd UseIt.sh to build any ports!"
+    exit 1
+fi
+
+if [ -z "$PORT_DIR" ]; then
+    echo "Must set PORT_DIR to where the source should be cloned."
+    exit 1
+fi
+
+function run_fetch_git() {
+    if [ -d "$PORT_DIR/.git" ]; then
+        (cd "$PORT_DIR" && git fetch && git reset --hard FETCH_HEAD)
+    else
+        git clone "$1" "$PORT_DIR"
+    fi
+}
+
+function run_configure_cmake() {
+    (
+        cd "$PORT_DIR"
+        cmake -DCMAKE_TOOLCHAIN_FILE="$SERENITY_ROOT/Toolchain/CMakeToolchain.txt" .
+    )
+}
+
+function run_configure_autotools() {
+    (
+        cd "$PORT_DIR"
+        ./configure --host=i686-pc-serenity
+    )
+}
+
+function run_make() {
+    (
+        cd "$PORT_DIR"
+        make $MAKEOPTS "$@"
+    )
+}
+
+function run_make_install() {
+    (
+        cd "$PORT_DIR"
+        make $INSTALLOPTS install "$@"
+    )
+}
+
+if [ -z "$1" ]; then
+    fetch
+    configure
+    build
+    install
+    exit 0
+fi
+
+if [ "$1" == "fetch" ]; then
+    fetch
+elif [ "$1" == "configure" ]; then
+    configure
+elif [ "$1" == "build" ]; then
+    build
+elif [ "$1" == "install" ]; then
+    install
+else
+    echo "Unknown verb: $1"
+    echo "Supported: (one of) fetch configure build install"
+    exit 1
+fi

Ports/README.md

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+# What's this?
+
+Serenity has software patched to run on it.
+These shell scripts will allow you to build that sort of software, easily.
+For example, if you want to install SDL2, simply run the SDL2.sh script.
+Note that you should have already built Serenity, and be in a Serenity build environment.
+
+# Using ports scripts
+
+To do everything, just run the script: `./SDL2.sh`
+To do a single step, you can specify it: `./SDL2.sh build`
+
+# How do I contribute?
+
+Port software, and add new scripts to build it of course :)

Ports/SDL2.sh

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+#!/bin/sh
+PORT_DIR=SDL
+function fetch() {
+    run_fetch_git "https://github.com/SerenityOS/SDL"
+}
+function configure() {
+    run_configure_cmake
+}
+function build() {
+    run_make
+}
+function install() {
+    run_make_install
+}
+source ./.port_include.sh