It seems that every ebuild gives a warning, "You should update your aclocal.m4 by running aclocal" before building. I do not speak aclocal so I cannot comment further, but I presume it means in the build directory. baz. S.
Its if it gets libtoolized, and will give that warning even if you then do run aclocal. This is just a warning, and most things that actually need running of aclocal, does do it to my knowledge. You should be able to ignore it (try to run autoreconf in a source dir ... lots of warnings =) ).
