lua51Packages.libluv: fix build (#510964)

  buildInputs = [ libuv ];

  nativeBuildInputs = [ cmake ];

  # Need to specify WITH_SHARED_LIBUV=ON cmake flag, but

  # Luarocks doesn't take cmake variables from luarocks config.

  # Need to specify it in rockspec. See https://github.com/luarocks/luarocks/issues/1160.

  knownRockspec = runCommand "luv-${version}.rockspec" { } ''

    patch ${src}/luv-scm-0.rockspec -o - > $out <<'EOF'

    --- a/luv-scm-0.rockspec

    +++ b/luv-scm-0.rockspec

    @@ -1,5 +1,5 @@

     package = "luv"

    -version = "scm-0"

    +version = "${version}"

     source = {

       url = 'git://github.com/luvit/luv.git'

     }

    @@ -24,6 +24,7 @@

     build =

       type = 'cmake',

       variables = {

    +     WITH_SHARED_LIBUV="ON",

          CMAKE_C_FLAGS="$(CFLAGS)",

          CMAKE_MODULE_LINKER_FLAGS="$(LIBFLAG)",

          LUA_LIBDIR="$(LUA_LIBDIR)",

    EOF

  rockspecFilename = "luv-scm-0.rockspec";

  postConfigure = ''

    mv "$rockspecFilename" "$generatedRockspecFilename"

    rockspecFilename="$generatedRockspecFilename"

    substituteInPlace "$rockspecFilename" \

      --replace-fail 'version = "scm-0"' "version = \"$version\""

  '';

  luarocksConfig.variables = {

    WITH_SHARED_LIBUV = "ON";

  };

  __darwinAllowLocalNetworking = true;

  doInstallCheck = true;