Tested and found to work perfectly for cue/bin to iso conversion. Some helpful details follow : $ emerge --info Portage 2.2.00.15200-prefix (prefix/darwin/macos/10.6/x86, gcc-4.2.1, unavailable, 10.2.0 i386) ================================================================= System uname: Darwin-10.2.0-i386-32bit Timestamp of tree: Fri, 22 Jan 2010 17:51:53 +0000 distcc 2.18.5-Apple.1 i386-apple-darwin10.0 (protocols 1 and 2) (default port 3632) [disabled] app-shells/bash: 4.0_p35 dev-lang/python: 2.6.4 sys-devel/autoconf: 2.63-r01.1 sys-devel/automake: 1.10.2-r00.1, 1.11.1 sys-devel/gcc-config: 1.4.1-r00.2 sys-devel/libtool: 2.2.6b ACCEPT_KEYWORDS="~x86-macos" ACCEPT_LICENSE="* -@EULA" CBUILD="i686-apple-darwin10" CFLAGS="-O2 -pipe -march=nocona" CHOST="i686-apple-darwin10" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-O2 -pipe -march=nocona" DISTDIR="/Users/robin/CodeBox/gentoo/usr/portage/distfiles" FEATURES="assume-digests collision-protect distlocks fixpackages news nostrip parallel-fetch preserve-libs protect-owned sfperms strict unmerge-logs unmerge-orphans userfetch" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" LANG="en_GB.UTF-8" LDFLAGS="" PKGDIR="/Users/robin/CodeBox/gentoo/usr/portage/packages" PORTAGE_CONFIGROOT="/Users/robin/CodeBox/gentoo/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/Users/robin/CodeBox/gentoo/var/tmp" PORTDIR="/Users/robin/CodeBox/gentoo/usr/portage" PORTDIR_OVERLAY="/Users/robin/CodeBox/gentoo/usr/local/portage" SYNC="rsync://rsync.prefix.freens.org/gentoo-portage-prefix" USE="aqua coreaudio cracklib cxx mmx mmxext modules ncurses nls objc objc++ prefix readline sse sse2 ssl unicode x86-macos zlib" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ELIBC="Darwin" INPUT_DEVICES="keyboard mouse" KERNEL="Darwin" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" RUBY_TARGETS="ruby18" USERLAND="GNU" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LC_ALL, LINGUAS, MAKEOPTS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS The process I used : $ cd $PORTAGE_CUSTOM_OVERLAY $ ecopy app-cdr/bchunk $ emerge bchunk Cheers.
added, it only needed a keyword (it was already in the tree..please check first)