$hierarchy{"x86_64-unknown-linux-gnu+gcc4.2"} = "x86_64-unknown-linux-gnu+gcc4.1";
$hierarchy{"x86_64-unknown-linux-gnu+gcc4.3"} = "x86_64-unknown-linux-gnu+gcc4.2";
-$hierarchy{"x86_64-unknown-linux-gnu+icc9"} = "x86_64-unknown-linux-gnu+gcc3.3";
-$hierarchy{"x86_64-unknown-linux-gnu+icc10"} = "x86_64-unknown-linux-gnu+icc9";
+$hierarchy{"x86_64-unknown-linux-gnu+icc9"} = "x86_64-unknown-linux-gnu+gcc3.3";
+$hierarchy{"x86_64-unknown-linux-gnu+icc10"} = "x86_64-unknown-linux-gnu+icc9";
-$hierarchy{"powerpc-apple-darwin8.8.0+gcc4.0"} = "generic";
+$hierarchy{"powerpc-apple-darwin8.8.0+gcc4.0"} = "generic";
$hierarchy{"powerpc-apple-darwin8.10.0+gcc4.0"} = "powerpc-apple-darwin8.8.0+gcc4.0";
+$hierarchy{"ia64-unknown-linux-gnu+icc9"} = "x86_64-unknown-linux-gnu+icc9";
+$hierarchy{"ia64-unknown-linux-gnu+icc10"} = "ia64-unknown-linux-gnu+icc9";
+
# derive mac os x from mac os x because they use the same random number
# generator
$hierarchy{"i386-apple-darwin8.10.1+gcc4.0"} = "powerpc-apple-darwin8.10.0+gcc4.0";