diff --git a/.gitignore b/.gitignore
index a83872b..f112ff4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 **/bg.inc
 **/bg.raw
 **/fox32os.img
+**/fox32os.img.tmp
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..05cdcb6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,48 @@
+RYFS := $(CURDIR)/meta/ryfs/ryfs.py
+FOX32ASM := ../fox32asm/target/release/fox32asm
+GFX2INC := ../tools/gfx2inc/target/release/gfx2inc
+
+IMAGE_SIZE := 16777216
+BOOTLOADER := bootloader/bootloader.bin
+
+all: fox32os.img
+
+base_image:
+	mkdir -p base_image
+
+base_image/kernel.fxf: kernel/main.asm
+	$(FOX32ASM) $< $@
+
+base_image/barclock.fxf: applications/barclock/main.asm
+	$(FOX32ASM) $< $@
+
+base_image/terminal.fxf: applications/terminal/main.asm
+	$(FOX32ASM) $< $@
+
+base_image/foxpaint.fxf: applications/foxpaint/main.asm
+	$(FOX32ASM) $< $@
+
+base_image/bg.fxf: applications/bg/main.asm
+	$(FOX32ASM) $< $@
+
+base_image/bg.raw: applications/bg/bg.inc
+	$(FOX32ASM) $< $@
+
+applications/bg/bg.inc: applications/bg/bg.png
+	$(GFX2INC) 640 480 $< $@
+
+bootloader/bootloader.bin: bootloader/main.asm
+	$(FOX32ASM) $< $@
+
+FILES = \
+	base_image/kernel.fxf \
+	base_image/barclock.fxf \
+	base_image/terminal.fxf \
+	base_image/foxpaint.fxf \
+	base_image/bg.fxf \
+	base_image/bg.raw
+
+fox32os.img: $(BOOTLOADER) $(FILES)
+	$(RYFS) -s $(IMAGE_SIZE) -l fox32os -b $(BOOTLOADER) create fox32os.img.tmp
+	cd base_image; for file in *; do $(RYFS) add ../fox32os.img.tmp $$file; done
+	cp fox32os.img.tmp fox32os.img
diff --git a/README.md b/README.md
index 695ef0f..738232f 100644
--- a/README.md
+++ b/README.md
@@ -8,5 +8,11 @@
 
 Stable releases are available on the [Releases page](https://github.com/fox32-arch/fox32os/releases).
 
+## How to build
+
+- Download [tools](https://github.com/fox32-arch/tools) and [fox32asm](https://github.com/fox32-arch/fox32asm).
+  Either use the pre-built binaries or build them.
+- Run `make`
+
 ## License
 This project is licensed under the [MIT license](LICENSE).
diff --git a/build.sh b/build.sh
deleted file mode 100755
index 460d4af..0000000
--- a/build.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-mkdir -p base_image
-
-# if fox32os.img doesn't exist, then create it
-if [ ! -f fox32os.img ]; then
-    echo "fox32os.img not found, creating it"
-
-    echo "assembling bootloader"
-    ../fox32asm/target/release/fox32asm bootloader/main.asm bootloader/bootloader.bin
-
-    meta/ryfs/ryfs.py -s 16777216 -l fox32os -b bootloader/bootloader.bin create fox32os.img
-
-    rm bootloader/bootloader.bin
-fi
-
-echo "assembling kernel"
-../fox32asm/target/release/fox32asm kernel/main.asm base_image/kernel.fxf
-
-echo "assembling barclock"
-../fox32asm/target/release/fox32asm applications/barclock/main.asm base_image/barclock.fxf
-
-echo "assembling terminal"
-../fox32asm/target/release/fox32asm applications/terminal/main.asm base_image/terminal.fxf
-
-echo "assembling foxpaint"
-../fox32asm/target/release/fox32asm applications/foxpaint/main.asm base_image/foxpaint.fxf
-
-echo "assembling bg"
-../fox32asm/target/release/fox32asm applications/bg/main.asm base_image/bg.fxf
-
-echo "creating bg.raw"
-../tools/gfx2inc/target/release/gfx2inc 640 480 applications/bg/bg.png applications/bg/bg.inc
-../fox32asm/target/release/fox32asm applications/bg/bg.inc base_image/bg.raw
-
-echo "adding files to fox32os.img"
-cd base_image
-for file in ./*; do
-    ../meta/ryfs/ryfs.py add ../fox32os.img $file
-done