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.github/workflows/main.yml

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+name: Build
+
+on: workflow_dispatch 
+
+jobs:
+  build:
+    name: Build
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: msys2/setup-msys2@v2
+        with:
+          msystem: UCRT64
+          update: true
+          # install: git mingw-w64-x86_64-toolchain
+
+    - name: Build x86
+      shell: cmd
+      run: call build.bat x86
+
+    - name: Build x64
+      shell: cmd
+      run: call build.bat
+
+    - uses: actions/upload-artifact@v2
+      with:
+        name: gnumake
+        path: |
+          ./dist
+        if-no-files-found: ignore # 'warn' or 'ignore' are also available, defaults to `warn`
+        retention-days: 1

.gitignore

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+make-*
+/dist

build.bat

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+@echo off
+
+set arch=
+set vcvars=
+
+:next-arg
+if "%1"=="" goto args-done
+if /i "%1"=="x86"           set arch=x86&set vcvars=vcvars32.bat&goto arg-ok
+if /i "%1"=="x64"           set arch=x64&set vcvars=vcvars64.bat&goto arg-ok
+
+:arg-ok
+shift
+goto next-arg
+
+:args-done
+if "%arch%" == "" set arch=x64& set vcvars=vcvars64.bat
+
+if exist "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\%vcvars%" (
+  call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\%vcvars%"
+) else (
+  call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\%vcvars%"
+)
+
+set Path=%Path%;C:\msys64\usr\bin
+
+set tag=4.3
+set name=make-%tag%
+set zipname=%name%.zip
+
+echo tag: %tag%
+
+if not exist %zipname% powershell.exe -nologo -noprofile -command "& { (new-object System.Net.WebClient).DownloadFile('https://github.com/mirror/make/archive/refs/tags/%tag%.zip', '%zipname%'); exit !$?; }"
+if exist %name% rd /s /q %name%
+powershell.exe -nologo -noprofile -command "& { param([String]$sourceArchiveFileName, [String]$destinationDirectoryName); Add-Type -A 'System.IO.Compression.FileSystem'; Add-Type -A 'System.Text.Encoding'; [IO.Compression.ZipFile]::ExtractToDirectory($sourceArchiveFileName, $destinationDirectoryName, [System.Text.Encoding]::UTF8); exit !$?; }" -sourceArchiveFileName "%zipname%" -destinationDirectoryName "."
+
+cd "%name%"
+
+call bootstrap.bat
+call build_w32.bat
+cd ..
+if not exist .\dist mkdir .\dist
+copy /Y "%name%\WinRel\gnumake.exe" "dist\gnumake-msvc-%arch%.exe"