function getlibrary ([string] $URI, [string] $filename, [string] $hash, [string] $destdir) {
	$wc = New-Object Net.WebClient
	[string] $downloadhash = $null
	try {
		$wc.DownloadFile($URI, $filename)
		$downloadhash = $(Get-FileHash $filename -Algorithm SHA256).Hash
	} catch {
		Write-Host "${filename}: failed to download"
		exit 1
	}
	if ($hash -ne $downloadhash) {
		Write-Host "${filename}: SHA256 mismatch ($downloadhash)"
		exit 1
	}
	Expand-Archive -DestinationPath $destdir $filename
}

getlibrary 'https://www.zlib.net/zlib131.zip' 'zlib.zip' '72af66d44fcc14c22013b46b814d5d2514673dda3d115e64b690c1ad636e7b17' .
getlibrary 'https://github.com/glennrp/libpng/archive/refs/tags/v1.6.37.zip' 'libpng.zip'  'c2c50c13a727af73ecd3fc0167d78592cf5e0bca9611058ca414b6493339c784' .
getlibrary 'https://github.com/lexxmark/winflexbison/releases/download/v2.5.24/win_flex_bison-2.5.24.zip' 'winflexbison.zip'  '39c6086ce211d5415500acc5ed2d8939861ca1696aee48909c7f6daf5122b505' install_dir

Move-Item zlib-1.3.1 zlib
Move-Item libpng-1.6.37 libpng