Ed Plese has kindly provided OpenSolaris x86 binaries for the Arduino development environment. This includes all the necessary dependencies such as avr-gcc. and will work on OpenSolaris x86 build snv_113 onwards. The tarball is hosted on the Sun Download Centre, see the page at OpenSolaris.org for more details and links to the downloads.
Thanks to Ed for doing the work necessary to make this available for the OpenSolaris community.