diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 00bf9aa..984aa31 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,4 +13,4 @@ jobs:
         uses: actions/checkout@v3
       - name: Run build script
         run: |
-          ./build.sh
+          make
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d66bf1c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,20 @@
+CC = gcc
+CFLAGS = -Wall -ggdb
+SRCS = $(shell find ./src -type f -name "*.c")
+BUILD_DIR = $(shell git rev-parse --show-toplevel)/build
+OBJS = $(SRCS:.c=.o)
+
+all: $(BUILD_DIR)/cdo
+
+$(BUILD_DIR)/cdo: $(OBJS)
+	@mkdir -p $(BUILD_DIR)
+	$(CC) $(CFLAGS) -o $@ $^
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+clean:
+	rm -rf $(BUILD_DIR) $(OBJS)
+
+.PHONY: all