diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000..7106dc5c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,83 @@
+#
+# UPX top-level Makefile - needs GNU make and CMake >= 3.13
+#
+
+# NOTE: if you only have CMake 3.10 then you can invoke cmake manually like this:
+#   mkdir -p build/release
+#   cd build/release
+#   cmake ../..
+#   cmake --build .
+
+CMAKE = cmake
+UPX_CMAKE_BUILD_FLAGS += --parallel
+#UPX_CMAKE_BUILD_FLAGS += --verbose
+
+# check git submodules
+ifeq ($(wildcard ./vendor/doctest/doctest/.),)
+  $(error ERROR: missing git submodule; run 'git submodule update --init')
+endif
+ifeq ($(wildcard ./vendor/lzma-sdk/C/.),)
+  $(error ERROR: missing git submodule; run 'git submodule update --init')
+endif
+ifeq ($(wildcard ./vendor/ucl/include/.),)
+  $(error ERROR: missing git submodule; run 'git submodule update --init')
+endif
+ifeq ($(wildcard ./vendor/zlib/crc32.c),)
+  $(error ERROR: missing git submodule; run 'git submodule update --init')
+endif
+
+#***********************************************************************
+# default
+#***********************************************************************
+
+__check_cache = $(if $(wildcard $1/CMakeCache.txt),@true,)
+run_config = $(call __check_cache,$1) $(CMAKE) -S . -B $1 $(UPX_CMAKE_CONFIG_FLAGS) -DCMAKE_BUILD_TYPE=$2
+run_build  =                          $(CMAKE) --build $1 $(UPX_CMAKE_BUILD_FLAGS) --config $2
+
+default: build/release
+
+build/debug: PHONY
+	$(call run_config,$@,Debug)
+	$(call run_build,$@,Debug)
+
+build/release: PHONY
+	$(call run_config,$@,Release)
+	$(call run_build,$@,Release)
+
+#***********************************************************************
+# some pre-defined build configurations
+#***********************************************************************
+
+# force building with gcc/g++
+build/%-gcc: export CC=gcc
+build/%-gcc: export CXX=g++
+build/debug-gcc: PHONY
+	$(call run_config,$@,Debug)
+	$(call run_build,$@,Debug)
+build/release-gcc: PHONY
+	$(call run_config,$@,Release)
+	$(call run_build,$@,Release)
+
+# force building with clang/clang++
+build/%-clang: export CC=clang
+build/%-clang: export CXX=clang++
+build/debug-clang: PHONY
+	$(call run_config,$@,Debug)
+	$(call run_build,$@,Debug)
+build/release-clang: PHONY
+	$(call run_config,$@,Release)
+	$(call run_build,$@,Release)
+
+# cross compiler: Windows mingw-w64
+build/%-cross-mingw64: export CC=x86_64-w64-mingw32-gcc
+build/%-cross-mingw64: export CXX=x86_64-w64-mingw32-g++
+#   disable sanitize to avoid link errors on GitHub CI
+build/%-cross-mingw64: UPX_CMAKE_CONFIG_FLAGS += -DUPX_CONFIG_DISABLE_SANITIZE=1
+build/debug-cross-mingw64: PHONY
+	$(call run_config,$@,Debug)
+	$(call run_build,$@,Debug)
+build/release-cross-mingw64: PHONY
+	$(call run_config,$@,Release)
+	$(call run_build,$@,Release)
+
+.PHONY: default PHONY