diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..3ba887b
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,43 @@
+name: Build harvest using gcc
+on: [push, pull_request]
+
+jobs:
+ shared:
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
+        version: [11]
+    runs-on: '${{ matrix.os }}'
+    name: 'Version: ${{ matrix.os }} / ${{ matrix.version }}'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Set up GCC
+        uses: egor-tensin/setup-gcc@v1
+        with:
+          version: '${{ matrix.version }}'
+          platform: '${{ matrix.platform }}'
+          cc: 1
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          # install deps
+          sudo apt-get install --force-yes pkg-config luarocks libluajit-5.1-dev curl mingw-w64 mingw-w64-x86-64-dev
+          sudo luarocks install luastatic
+      - name: Build
+        run: |
+          make && mv harvest harvest.elf
+          make clean
+          make win64
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          draft: true
+          generate_release_notes: true
+          fail_on_unmatched_files: true
+          files: |
+            harvest.elf
+            harvest.exe
diff --git a/Makefile b/Makefile
index d3a5d6f..85d5c30 100644
--- a/Makefile
+++ b/Makefile
@@ -11,34 +11,35 @@ LDADD ?= /usr/lib/x86_64-linux-gnu/libluajit-5.1.a -lm -ldl
 
 MUSL_LDADD ?= /usr/lib/${ARCH}-linux-musl/libc.a
 
-all: devuan-luajit-shared
+all: shared
 
-luajit:
-	make -C src/luajit CC=$(CC) CFLAGS="$(CFLAGS)"
-
-
-luajit-win:
-	make -C src/luajit HOST_CC=gcc CC=$(CC) CFLAGS="$(CFLAGS)" TARGET_SYS=Windows
-
-luastatic:
+shared:
 	CC=$(CC) AR=$(AR) INCLUDE="$(INCLUDE)" LDADD="$(LDADD)" CFLAGS="$(CFLAGS)" make -C src
-
-devuan-luajit-shared: luastatic
 	$(CC) -o harvest $(CFLAGS) $(INCLUDE) src/harvest.luastatic.c src/lfs.a $(LDADD)
 
-devuan-luajit-static: LDADD = src/luajit/src/libluajit.a /usr/lib/${ARCH}-linux-musl/libc.a
-devuan-luajit-static: INCLUDE = -I luajit/src
-devuan-luajit-static: CC = musl-gcc
-devuan-luajit-static: CFLAGS = -Os -static
-devuan-luajit-static: luastatic luajit
-	$(CC) -static -o harvest $(CFLAGS) -I src/luajit/src src/harvest.luastatic.c src/lfs.a $(LDADD) -lm
-
-mingw32-luajit-static: CC=x86_64-w64-mingw32-gcc
-mingw32-luajit-static: AR=x86_64-w64-mingw32-ar
-mingw32-luajit-static: INCLUDE = -I luajit/src
-mingw32-luajit-static: LDADD = src/luajit/src/libluajit.a
-mingw32-luajit-static: LDLIBS=-lm
-mingw32-luajit-static: luastatic luajit-win
+static: LDADD = /usr/lib/${ARCH}-linux-gnu/libluajit-5.1.a /usr/lib/${ARCH}-linux-musl/libc.a
+static: CC = musl-gcc
+static: CFLAGS = -O3 --fast-math -static
+static:
+	CC=$(CC) AR=$(AR) INCLUDE="$(INCLUDE)" LDADD="$(LDADD)" CFLAGS="$(CFLAGS)" make -C src static
+	$(CC) -static -o harvest $(CFLAGS) $(INCLUDE) src/harvest.luastatic.c src/lfs.a $(LDADD) -lm
+
+luajit-win64: CC=x86_64-w64-mingw32-gcc
+luajit-win64: AR=x86_64-w64-mingw32-ar
+luajit-win64:
+	if ! [ -r luajit.tar.gz ]; then curl -L https://luajit.org/download/LuaJIT-2.1.0-beta3.tar.gz > luajit.tar.gz; fi
+	if ! [ -d luajit ]; then mkdir -p luajit && tar -C luajit -xf luajit.tar.gz ; fi
+	mkdir -p luajit/include && cp -ra luajit/*/src/*.h luajit/include/
+	make -C luajit/Lua* HOST_CC=gcc CC=$(CC) CFLAGS="$(CFLAGS)" TARGET_SYS=Windows BUILDMODE=static
+	cp luajit/Lua*/src/libluajit.a luajit/
+
+win64: CC=x86_64-w64-mingw32-gcc
+win64: AR=x86_64-w64-mingw32-ar
+win64: INCLUDE = -I luajit/include
+win64: LDADD = luajit/libluajit.a
+win64: LDLIBS=-lm
+win64: luajit-win64
+	CC=$(CC) AR=$(AR) INCLUDE="$(INCLUDE)" LDADD="$(LDADD)" CFLAGS="$(CFLAGS)" make -C src static
 	$(CC) -static -o harvest.exe $(CFLAGS) $(INCLUDE) src/harvest.luastatic.c src/lfs.a $(LDADD)
 
 win32: mingw32-luajit-static
diff --git a/src/Makefile b/src/Makefile
index bdb124c..4184c57 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -9,3 +9,10 @@ all:
 	$(AR) rcs lfs.a lfs.o
 	CC="" luastatic $(SOURCES) lfs.a
 	$(CC) -c $(INCLUDE) $(CFLAGS) harvest.luastatic.c
+
+
+static:
+	$(CC) -c $(INCLUDE) $(CFLAGS) lfs.c -o lfs.o
+	$(AR) rcs lfs.a lfs.o
+	-CC="" luastatic $(SOURCES) lfs.a -static $(INCLUDES)
+	$(CC) -c $(INCLUDE) $(CFLAGS) harvest.luastatic.c
diff --git a/src/harvest.lua b/src/harvest.lua
index fb79185..5b754e1 100755
--- a/src/harvest.lua
+++ b/src/harvest.lua
@@ -30,15 +30,6 @@ local align = require'align'
 local function stderr(_msg) io.stderr:write(_msg..'\n') end
 local function stdout(_msg) io.stdout:write(_msg..'\n') end
 
--- debug
-DEBUG=0
-local inspect = require'inspect'
-local function I(o) 
-   if DEBUG > 0 then stderr( inspect.inspect(o) ) end end
-local function D(s)
-   if DEBUG > 0 then stderr(s) end
-end
-
 -- # fuzzy thresholds
 -- #
 -- # this is the most important section to tune the selection: the higher
@@ -76,13 +67,11 @@ local function analyse_path(basedir, pathname, level)
    local target = pathname or basedir
    local curlev = level or 1
    local scores = { other = { } }
-   -- D("analyse: "..target)
    local path
    for path in lfs.dir(target) do
 	  if not (path == '.' or path == '..') then
 		 local tarpath = target..'/'..path
 		 if lfs.attributes(tarpath,"mode") == "directory" then
-			D("found dir:\t"..tarpath.." ("..curlev..")")
 			analyse_path(basedir, tarpath, curlev+1)
 
 	 else -- file in subdir
@@ -90,7 +79,6 @@ local function analyse_path(basedir, pathname, level)
 			if ftype then
 			   if not scores[ftype] then scores[ftype] = { } end
 			   table.insert(scores[ftype], tarpath)
-			   -- D("found "..ftype..":\t"..tarpath)
 			else
 			   table.insert(scores['other'], tarpath)
 			end
@@ -161,7 +149,7 @@ cli:option("-o, --output=FORMAT", "csv", 'human')
 cli:flag("--dir", "select only directories")
 cli:flag("--file", "select only files")
 cli:flag("-d", "run in DEBUG mode", function() DEBUG=1 end)
-cli:flag("-v, --version", "print the version and exits", function()
+cli:flag("-v, --version", "print the version and exit", function()
 			print("Harvest version 0.8") os.exit(0) end)
 
 local args, err = cli:parse(arg)
@@ -196,11 +184,10 @@ elseif args then -- default command is scan
    local fattr = lfs.attributes
    for file in lfs.dir(args.path) do
       local filepath = args.path.."/"..file
-      D("analyze "..filepath)
       if not (file == '.' or file == '..') then
          local attr = fattr(filepath)
          attr.name = file
-         I(attr)
+         -- I(attr)
          if type(attr) == 'table' then -- safety to os stat
             if attr.mode == "directory" then
                attr.type = 'dir'