It's ok.
Thanks,
Fabrice

2016-06-15 14:58 GMT+02:00 Wolfgang Schuster <schuster.wolfgang@gmail.com>:
15. Juni 2016 um 14:48
Hi Wolfgang,
what directory I put this file knowing that I installed the standalone version in /home/fab/context
Fabrice

The commend was meant for Hans, all *you* have to do is update your TeX installation, afterwards you can try the following example:

\useMPlibrary[mat]

\setupmathstackers
  [both]
  [color=darkred,
   alternative=mp]

\setupmathstackers
  [top]
  [color=darkred,
   alternative=mp]

\setupmathstackers
  [bottom]
  [color=darkred,
   alternative=mp]

\starttext

$\overbracket   {a+b+c+d} \quad \underbracket    {a+b+c+d} \quad \doublebracket{a+b+c+d}$ \blank
$\overparent    {a+b+c+d} \quad \underparent     {a+b+c+d} \quad \doubleparent {a+b+c+d}$ \blank
$\overbrace     {a+b+c+d} \quad \underbrace      {a+b+c+d} \quad \doublebrace  {a+b+c+d}$ \blank
$\overbar       {a+b+c+d} \quad \underbar        {a+b+c+d} \quad \doublebar    {a+b+c+d}$ \blank

$\overleftarrow  {a+b+c+d} \quad \overrightarrow  {a+b+c+d} $ \blank
$\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank

\stoptext

Wolfgang

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