Oneiric is now open for development, with syncs from unstable starting shortly. The development version starts with an updated GCC and binutils, some soname changes (gmp, libffi, boost) and re-enables the default linker settings, which were disabled just before the natty release.
When merging or requesting a sync, please look at the list of known build failures ; bugs (tagged `ftbfs') are filed for every packages which fails to build from source. Please close these with the merged uploads.
Please check your uploads in an oneiric chroot, don't just test in a natty environment. See  how to setup such a development chroot.
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