$hierarchy{"i686-pc-linux-gnu+gcc3.4"} = "i686-pc-linux-gnu+gcc3.3";
$hierarchy{"i686-pc-linux-gnu+gcc4.0"} = "i686-pc-linux-gnu+gcc3.4";
$hierarchy{"i686-pc-linux-gnu+gcc4.1"} = "i686-pc-linux-gnu+gcc4.0";
+$hierarchy{"i686-pc-linux-gnu+gcc4.2"} = "i686-pc-linux-gnu+gcc4.1";
+$hierarchy{"i686-pc-linux-gnu+gcc4.3"} = "i686-pc-linux-gnu+gcc4.2";
$hierarchy{"i686-pc-linux-gnu+icc7"} = "generic";
$hierarchy{"i686-pc-linux-gnu+icc7.1"} = "i686-pc-linux-gnu+icc7";
+$hierarchy{"i686-pc-linux-gnu+icc8"} = "i686-pc-linux-gnu+icc7.1";
+$hierarchy{"i686-pc-linux-gnu+icc9"} = "i686-pc-linux-gnu+icc8";
$hierarchy{"mips-sgi-irix6.5+MIPSpro7.4"} = "generic";
$hierarchy{"x86_64-unknown-linux-gnu+gcc3.4"} = "x86_64-unknown-linux-gnu+gcc3.3";
$hierarchy{"x86_64-unknown-linux-gnu+gcc4.0"} = "x86_64-unknown-linux-gnu+gcc3.4";
$hierarchy{"x86_64-unknown-linux-gnu+gcc4.1"} = "x86_64-unknown-linux-gnu+gcc4.0";
+$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";