gnu make nightmare

it should be the third time than i blogging the complaince on the gnu make toolchains.
* long time!
it takes hours for build a project like mozilla firefox from source.
* bad incremetal build
maybe it not born to be. today i use 'hg update' and got 3 updated source, and "make -f client.mk build" , it still take hours.
* dumb behavie
i cannot understand the foolish behavie of build, the configure says "something yes, something no", is really cramsy, and the huge old source people donnt seem to conside a newly clear light agity build system, since they maybe thought the things are just perfect.
and the build chain tools is really obstatic for me to enjoy the gnu world.