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We need to talk about the
    powerpc-apple-darwin
platform rather than the
    powerpc_apple_darwin
platform. Spotted by Claus / Thorkil.

According to trac #1558, 2.5.2 should work. It's possible a lower bound,
e.g. 2.5, would suffice.

into their component parts
    if_compiler_type
    expect_fail
    expect_broken