OK many thanks Henes I will compile that tonight...

Other question : I have readed here
http://www.nonsoloamiga.com/index.php?topic=757.0
that after creating a context this way
TinyGLBase = OpenLibrary("tinygl.library", 0);
tgl_context=GLInit();
glAInitializeContextBitMap(tgl_context,bm);

that glASwapBuffers(tgl_context); is needed to make a frame update

Is it true ? I was supposing that there is no double-buffering in this case so that all is already drawn in the bitmap
so that i only need a
glFlush();
glFinish();
to make a frame update

Alain