in the ebuild one should change the path to ebuild from net-www to
app-admin.
#ebuild
/var/db/pkg/net-www/webalizer-2.01.10-r3/webalizer-2.01.10-r3.ebuild
config !!! doebuild:
/var/db/pkg/net-www/webalizer-2.01.10-r3/webalizer-2.01.10-r3.ebuild not
found.

#ebuild
/var/db/pkg/app-admin/webalizer-2.01.10-r3/webalizer-2.01.10-r3.ebuild
config

and if someone needs localized webalizer then line 29 of ebuild should be
changed from:
econf --enable-dns || die
to (in my case)
econf \
--with-language=polish \
--enable-dns || die

good luck.