diff --git a/Makefile.gwh b/Makefile.gwh
new file mode 100644
index 0000000..f95ad24
--- /dev/null
+++ b/Makefile.gwh
@@ -0,0 +1,114 @@
+# Simple Makefile to build saturn_bertolotti
+
+MAKEFLAGS +=-j$(NUM_CORES) -l$(NUM_CORES)
+
+CC ?= gcc
+
+OPTIM ?= 2
+
+CFLAGS = -g -O$(OPTIM) -I./src/ -D_GNU_SOURCE=1 -I./Chf -L./Chf/st_build -lutil
+LIBS = -lm -lChf -lXm
+
+X11CFLAGS = $(shell pkg-config --cflags x11 xext) -D_GNU_SOURCE=1
+X11LIBS = $(shell pkg-config --libs x11 xext xt)
+
+CFLAGS += $(X11CFLAGS)
+LIBS += $(X11LIBS)
+
+FULL_WARNINGS = no
+ifeq ($(FULL_WARNINGS), yes)
+	CFLAGS += -Wall -Wextra -Wpedantic -Wno-unused-parameter -Wno-unused-function -Wconversion -Wdouble-promotion -Wno-sign-conversion -fsanitize=undefined -fsanitize-trap
+endif
+
+DOTOS = src/cpu.o \
+	src/debug.o \
+	src/dis.o \
+	src/disk_io.o \
+	src/disk_io_obj.o \
+	src/display.o \
+	src/emulator.o \
+	src/flash49.o \
+	src/hdw.o \
+	src/hw_config.o \
+	src/keyb.o \
+	src/modules.o \
+	src/monitor.o \
+	src/romram.o \
+	src/romram49.o \
+	src/saturn.o \
+	src/serial.o \
+	src/x11.o \
+	src/x_func.o
+
+.PHONY: all clean clean-all pretty-code install mrproper
+
+all: saturn pack
+
+# Binaries
+saturn: $(DOTOS)
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)
+
+pack: src/pack.o src/disk_io.o src/debug.o
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)
+
+# Cleaning
+clean:
+	rm -f src/*.o
+
+mrproper: clean
+	rm -f pack saturn
+
+clean-all: mrproper
+
+# Formatting
+pretty-code:
+	clang-format -i src/*.c src/*.h
+
+# # Installing
+# ROMs/sxrom-a:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-a.zip" --output - | funzip > "ROMs/sxrom-a"
+# ROMs/sxrom-b:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-b.zip" --output - | funzip > "ROMs/sxrom-b"
+# ROMs/sxrom-c:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-c.zip" --output - | funzip > "ROMs/sxrom-c"
+# ROMs/sxrom-d:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-d.zip" --output - | funzip > "ROMs/sxrom-d"
+# ROMs/sxrom-e:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-e.zip" --output - | funzip > "ROMs/sxrom-e"
+# ROMs/sxrom-j:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-j.zip" --output - | funzip > "ROMs/sxrom-j"
+# ROMs/gxrom-l:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-l.zip" --output - | funzip > "ROMs/gxrom-l"
+# ROMs/gxrom-m:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-m.zip" --output - | funzip > "ROMs/gxrom-m"
+# ROMs/gxrom-p:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-p.zip" --output - | funzip > "ROMs/gxrom-p"
+# ROMs/gxrom-r:
+#	curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-r.zip" --output - | funzip > "ROMs/gxrom-r"
+
+# get-roms: ROMs/sxrom-a ROMs/sxrom-b ROMs/sxrom-c ROMs/sxrom-d ROMs/sxrom-e ROMs/sxrom-j ROMs/gxrom-l ROMs/gxrom-m ROMs/gxrom-p ROMs/gxrom-r
+
+# install: all get-roms
+#	install -m 755 -d -- $(DESTDIR)$(PREFIX)/bin
+#	install -c -m 755 x48ng $(DESTDIR)$(PREFIX)/bin/x48ng
+
+#	install -m 755 -d -- $(DESTDIR)$(PREFIX)/share/x48ng
+#	install -c -m 755 mkcard $(DESTDIR)$(PREFIX)/share/x48ng/mkcard
+#	install -c -m 755 dump2rom $(DESTDIR)$(PREFIX)/share/x48ng/dump2rom
+#	install -c -m 755 checkrom $(DESTDIR)$(PREFIX)/share/x48ng/checkrom
+#	install -c -m 644 hplogo.png $(DESTDIR)$(PREFIX)/share/x48ng/hplogo.png
+#	cp -R ROMs/ $(DESTDIR)$(PREFIX)/share/x48ng/
+#	sed "s|@PREFIX@|$(PREFIX)|g" setup-x48ng-home.sh > $(DESTDIR)$(PREFIX)/share/x48ng/setup-x48ng-home.sh
+#	chmod 755 $(DESTDIR)$(PREFIX)/share/x48ng/setup-x48ng-home.sh
+
+#	install -m 755 -d -- $(DESTDIR)$(MANDIR)/man1
+#	sed "s|@VERSION@|$(VERSION_MAJOR).$(VERSION_MINOR).$(PATCHLEVEL)|g" x48ng.man.1 > $(DESTDIR)$(MANDIR)/man1/x48ng.1
+#	gzip -9  $(DESTDIR)$(MANDIR)/man1/x48ng.1
+
+#	install -m 755 -d -- $(DESTDIR)$(DOCDIR)
+#	cp -R AUTHORS LICENSE README* doc* romdump/ $(DESTDIR)$(DOCDIR)
+#	x48ng --print-config > config.lua
+#	install -c -m 644 config.lua $(DESTDIR)$(DOCDIR)/config.lua
+
+#	install -m 755 -d -- $(DESTDIR)$(PREFIX)/share/applications
+#	sed "s|@PREFIX@|$(PREFIX)|g" x48ng.desktop > $(DESTDIR)$(PREFIX)/share/applications/x48ng.desktop