Banshee-1.2 seem to require at least dev-lang/mono-1.2.6 (as does
dev-dotnet/mono-addins for a different reasons, see bug 236169).
With the current stable Mono (1.2.5-r1), compiling gives this error:
Making all in Hyena
make[4]: Entering directory
`/var/tmp/portage/media-sound/banshee-1.2.0/work/banshee-1-1.2.0/src/Libraries/Hyena'
Compiling Hyena.dll...
./Hyena.Collections/QueuePipelineElement.cs(117,59): error CS0155: The type
caught or thrown must be derived from System.Exception
Mono-1.2.6 lets it compile OK.
emerge --info:
Portage 2.1.4.4 (default/linux/x86/2008.0/desktop, gcc-4.1.2, glibc-2.6.1-r0,
2.6.25-gentoo-r7 i686)
=================================================================
System uname: 2.6.25-gentoo-r7 i686 Intel(R) Celeron(R) CPU 2.66GHz
Timestamp of tree: Sat, 30 Aug 2008 03:04:01 +0000
ccache version 2.4 [enabled]
app-shells/bash: 3.2_p33
dev-java/java-config: 1.3.7, 2.1.6
dev-lang/python: 2.5.2-r6
dev-util/ccache: 2.4-r7
sys-apps/baselayout: 1.12.11.1
sys-apps/sandbox: 1.2.18.1-r2
sys-devel/autoconf: 2.13, 2.61-r2
sys-devel/automake: 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils: 2.18-r3
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool: 1.5.26
virtual/os-headers: 2.6.23-r3
ACCEPT_KEYWORDS="x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=pentium4 -O2 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/
/etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/terminfo
/etc/udev/rules.d"
CXXFLAGS="-march=pentium4 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="buildpkg ccache distlocks metadata-transfer sandbox sfperms strict
unmerge-orphans userfetch"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
LANG="en_US.utf8"
LC_ALL="en_US.utf8"
LDFLAGS="-Wl,--as-needed"
PKGDIR="/usr/portage/packages"
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="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="3dnow 3dnowext X a52 aac accessibility acl acpi alsa avahi berkdb
bluetooth branding bzip2 cairo caps cddb cdr cli cracklib crypt cups daap dbus
dri dv dvd dvdr dvdread eds emboss encode esd evo fam ffmpeg foomaticdb fortran
gdbm gif gnome gnome-keyring gnutls gpm gstreamer gtk hal iconv ipod ipv6
isdnlog java jpeg kerberos ldap libnotify logrotate mad midi mikmod mmx mmxext
mono mp3 mpeg mudflap ncurses nls nptl nptlonly ogg opengl openmp pam pcre pdf
perl png ppds pppd python qt3support quicktime readline reflection samba sasl
sdl session spell spl sse ssl startup-notification svg sysfs tcl tcpd tiff tk
truetype unicode usb vorbis x264 x86 xml xorg xulrunner xv xvid zlib"
ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1
emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m
maestro3 trident usb-audio via82xx via82xx-modem ymfpci"
ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file
hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug
rate route share shm softvol" 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="glibc" INPUT_DEVICES="evdev keyboard mouse void"
KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001
mtxorb ncurses text" USERLAND="GNU" VIDEO_CARDS="dummy fbdev vesa vga nvidia"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LINGUAS,
MAKEOPTS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
