if not modules then modules = { } end modules ['libs-imp-lz4'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkxl",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- https://packages.msys2.org/package/mingw-w64-x86_64-lz4?repo=mingw64

-- Instead of linking in libs like this we now do them optional. After all, once
-- we start adding more and more stuff statically we en dup with a mess.

local libname = "lz4"
local libfile = "liblz4"

local lz4lib = resolvers.libraries.validoptional(libname)

if not lz4lib then return end

local lz4_compress        = lz4lib.compress
----- lz4_decompress      = lz4lib.decompress
local lz4_decompresssize  = lz4lib.decompresssize
local lz4_framecompress   = lz4lib.framecompress
local lz4_framedecompress = lz4lib.framedecompress

local function okay()
    if resolvers.libraries.optionalloaded(libname,libfile) then
        okay = function() return true end
    else
        okay = function() return false end
    end
    return okay()
end

local lz4 = {
    compress        = function (...) return okay() and lz4_compress       (...) end,
 -- decompress      = function (...) return okay() and lz4_decompress     (...) end,
    decompresssize  = function (...) return okay() and lz4_decompresssize (...) end,
    framecompress   = function (...) return okay() and lz4_framecompress  (...) end,
    framedecompress = function (...) return okay() and lz4_framedecompress(...) end,
}

package.loaded[libname] = lz4

return lz4