diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..d86c696c
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,72 @@
+#############################################################################
+#
+# Author: Jia Tan
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+#############################################################################
+
+name: CI
+
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows running workflow manually
+  workflow_dispatch:
+
+jobs:
+  # When CMake can support disabling check types and
+  # encoders/decoders/threads, it will be combined to one Linux job
+  # and another matrix list.
+  Linux-Autotools:
+    # Just run on latest ubuntu
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        check_types: ["crc32", "crc32,crc64", "crc32,sha256", "crc32,crc64,sha256"]
+        disable: [encoders, decoders, bcj, delta, threads]
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - name: Install Dependencies
+        run: sudo apt-get install -y autoconf automake build-essential po4a autopoint
+      - name: Build
+        run: ./build-aux/ci_build.sh -b autotools -c ${{ matrix.check_types }} -d ${{ matrix.disable }}
+
+  Linux-CMake:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Dependencies
+        run: sudo apt-get install -y build-essential cmake
+      - name: Build
+        run: ./build-aux/ci_build.sh -b cmake
+
+  MacOS-Autotools:
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        check_types: ["crc32", "crc32,crc64", "crc32,sha256", "crc32,crc64,sha256"]
+        disable: [encoders, decoders, bcj, delta, threads]
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - name: Install Dependencies
+        run: brew install autoconf automake libtool po4a
+      - name: Build
+        run: ./build-aux/ci_build.sh -b autotools -c ${{ matrix.check_types }} -d ${{ matrix.disable }}
+
+  MacOS-CMake:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Dependencies
+        run: brew install cmake
+      - name: Build
+        run: ./build-aux/ci_build.sh -b cmake
+    
\ No newline at end of file
diff --git a/build-aux/ci_build.sh b/build-aux/ci_build.sh
new file mode 100755
index 00000000..76601580
--- /dev/null
+++ b/build-aux/ci_build.sh
@@ -0,0 +1,141 @@
+#!/bin/sh
+#
+#############################################################################
+#
+# Script meant to be used for Continuous Integration automation for POSIX
+# systems. On GitHub, this is used by Ubuntu and MacOS builds.
+#
+#############################################################################
+#
+# Author: Jia Tan
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+#############################################################################
+
+set -e
+
+USAGE="Usage: $0 -b [autotools|cmake] -c [crc32|crc64|sha256] -d [encoders,decoders,bcj,delta,threads] -l [destdir] -s [srcdir]"
+
+# Absolute path of script directory
+ABS_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
+
+# Default CLI option values
+BUILD_SYSTEM="autotools"
+CHECK_TYPE="crc32,crc64,sha256"
+BCJ="y"
+DELTA="y"
+ENCODERS="y"
+DECODERS="y"
+THREADS="y"
+SRC_DIR="$ABS_DIR/../"
+DEST_DIR="$SRC_DIR/../xz_build"
+
+# Parse arguments
+while getopts b:c:d:l:s: opt; do
+	# b option can have either value "autotools" OR "cmake"
+	case ${opt} in
+	b)
+		case "$OPTARG" in
+			autotools) ;;
+			cmake) ;;
+			*) echo "Invalid build system: $OPTARG"; exit 1;;
+		esac
+		BUILD_SYSTEM="$OPTARG"
+	;;
+	# c options can be a comma separated list of check types to support
+	c)
+	for crc in $(echo $OPTARG | sed "s/,/ /g"); do 
+		case "$crc" in
+		crc32) ;;
+		crc64) ;;
+		sha256) ;;
+		*) echo "Invalid check type: $crc"; exit 1 ;;
+		esac
+	done
+	CHECK_TYPE="$OPTARG"
+	;;
+	# d options can be a comma separated list of things to disable at
+	# configure time
+	d)
+	for disable_arg in $(echo $OPTARG | sed "s/,/ /g"); do 
+		case "$disable_arg" in
+		encoders) ENCODERS="n" ;;
+		decoders) DECODERS="n" ;;
+		bcj) BCJ="n" ;;
+		delta) DELTA="n" ;;
+		threads) THREADS="n" ;;
+		*) echo "Invalid disable value: $disable_arg"; exit 1 ;;
+		esac
+	done	
+	;;
+	l) DEST_DIR="$OPTARG"
+	;;
+	s) SRC_DIR="$OPTARG"
+	;;
+	esac
+done
+
+# Build based on arguments
+mkdir -p "$DEST_DIR"
+case $BUILD_SYSTEM in
+	autotools)
+	# Run autogen.sh script
+	cd "$SRC_DIR"
+	"./autogen.sh"
+	cd "$DEST_DIR"
+	# Generate configure option values
+
+	EXTRA_OPTIONS=""
+	FILTER_LIST="lzma1,lzma2"
+
+	if [ "$BCJ" = "y" ]
+	then
+		FILTER_LIST="$FILTER_LIST,x86,powerpc,ia64,arm,armthumb,arm64,sparc"
+	fi
+
+	if [ "$DELTA" = "y" ]
+	then
+		FILTER_LIST="$FILTER_LIST,delta"
+	fi
+
+	if [ "$ENCODERS" = "y" ]
+	then
+		EXTRA_OPTIONS="$EXTRA_OPTIONS --enable-encoders=$FILTER_LIST"
+	else
+		EXTRA_OPTIONS="$EXTRA_OPTIONS --disable-encoders"
+	fi
+
+	if [ "$DECODERS" = "y" ]
+	then
+		EXTRA_OPTIONS="$EXTRA_OPTIONS --enable-decoders=$FILTER_LIST"
+	else
+		EXTRA_OPTIONS="$EXTRA_OPTIONS --disable-decoders"
+	fi
+
+	if [ "$THREADS" = "n" ]
+	then
+		EXTRA_OPTIONS="$EXTRA_OPTIONS --disable-threads"
+	fi
+
+	# Run configure script
+	"$SRC_DIR"/configure --enable-checks=$CHECK_TYPE $EXTRA_OPTIONS
+
+	# Build the project
+	make
+
+	# Run the tests
+	make check
+	;;
+
+	cmake)
+	# CMake currently does not support disabling encoders, decoders,
+	# threading, or check types. For now, just run the full build.
+	cd "$DEST_DIR"
+	cmake "$SRC_DIR/CMakeLists.txt" -B "$DEST_DIR"
+	make
+	make test
+	;;
+
+esac