root@/etc> use="-apache2" emerge -upv asterisk

These are the packages that I would merge, in order:

Calculating dependencies ...done!
[ebuild     U ] dev-libs/expat-1.95.8 [1.95.7-r1] -makecheck 310 kB 
[ebuild  N    ] net-www/apache-2.0.51-r1  +berkdb -debug -doc +gdbm -ipv6 -ldap +ssl -static -threads 6,585 kB 
[ebuild  N    ] dev-libs/newt-0.50.35-r3  103 kB 
[ebuild  N    ] media-sound/mpg123-0.59s-r4  -3dnow +esd -mmx -nas +oss 239 kB 
[ebuild  N    ] sys-kernel/gentoo-dev-sources-2.6.8-r7  -build -doc -ultra1 35,072 kB 
[ebuild  N    ] net-misc/zaptel-1.0.0  -devfs26 289 kB 
[ebuild  N    ] net-libs/libpri-1.0.0  48 kB 
[ebuild  N    ] net-libs/zapata-1.0.0  72 kB 
[ebuild  N    ] net-misc/asterisk-1.0.0  +alsa -apache2 -doc +gtk -mmx -mysql -nopri -nozaptel 10,993 kB 

Total size of downloads: 53,715 kB

root@/etc>