diff --git a/host/Makefile b/host/Makefile
new file mode 100644
index 0000000..2a4e790
--- /dev/null
+++ b/host/Makefile
@@ -0,0 +1,20 @@
+BINARY := host.prg
+
+BUILD_DIR := ./build
+SRC_DIR := ./src
+
+SRCS := $(shell find $(SRC_DIR) -name '*.s' -or -name '*.inc')
+TOPLEVEL := source.s
+
+CL := cl65
+
+CLFLAGS := -u __EXEHDR__ -t c64 -C c64-asm.cfg -l $(BUILD_DIR)/host.lst -Ln $(BUILD_DIR)/host.lbl
+
+$(BUILD_DIR)/$(BINARY): $(SRCS)
+	mkdir -p $(BUILD_DIR)
+	$(CL) -o $@ $(CLFLAGS) $(SRC_DIR)/$(TOPLEVEL)
+
+all: $(BUILD_DIR)/$(BINARY)
+
+preview: userprog.bin $(SRCS)
+	$(CL) -o $@ -D EMULATOR_PREVIEW $(CLFLAGS) $(SRC_DIR)/$(TOPLEVEL)
diff --git a/host/build.sh b/host/build.sh
deleted file mode 100755
index f06944f..0000000
--- a/host/build.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-# !/bin/bash
-#Note that program start at $080D
-cl65 -o build/host.prg -u __EXEHDR__ -t c64 -C c64-asm.cfg -l build/program.lst source.s -Ln build/program.lbl \
-
-#VICE do not like -
-sed -i 's/-/m/g' program.lbl
diff --git a/host/run.sh b/host/run.sh
index 725a15f..c53faaf 100755
--- a/host/run.sh
+++ b/host/run.sh
@@ -1,5 +1,5 @@
 # !/bin/bash
 killall x64sc
 
-./build.sh \
+make \
 && nohup flatpak run net.sf.VICE -windowypos 0 -windowxpos 960 -windowwidth 945 -windowheight 720 -moncommands program.lbl build/file.prg  </dev/null &>/dev/null &
diff --git a/host/run_retro_debugger.sh b/host/run_retro_debugger.sh
index f4b7844..95ed63b 100755
--- a/host/run_retro_debugger.sh
+++ b/host/run_retro_debugger.sh
@@ -1,4 +1,4 @@
 # !/bin/bash
-./build.sh &&
+make &&
 ./retrodebugger_label_build_tool/rdb_build_label.sh \
 && nohup retrodebugger -b retrodebugger_label_build_tool/new.labels.labels -c64 ./build/file.prg </dev/null &>/dev/null &