It would be really nice to have a variable that can be set in make.conf that turns on package building for all packages.
Drobbins has a better idea. Put EMERGE_OPTS="" in /etc/make.conf and have it passed to emerge automatically. Example EMERGE_OPTS="--usepkg --buildpkg" would make sure that emerge used binary packages if they exist, and make a binary package if it isn't.
fixed on cvs (EMERGE_OPTS now supported)
Is this documented anywhere? It doesnt seem to be in make.conf (as an example)