Using -MMD instead of -MD for depndency generation

[Holger Freyther]

Hi,

when typing make in the build directory of WebKit/GTK+ it takes multiple
minutes until the first file is compiled. I would like to reduce the size of the
.Plo (dep files) in my build tree and build them with -MMD instead of -MD. Is
there a way to instruct automake to use -MMD for gcc3 like depmode?

thanks
  holger