Use cargo directly.
@@ -13,6 +13,4 @@ cd cargo
# use stage0 from rustc build
STAGE0=../build/*/stage0/bin
-./configure --prefix=$PREFIX --cargo=$STAGE0/cargo --rustc=$STAGE0/rustc --rustdoc=$STAGE0/rustdoc
-make
-make install
+PATH=$STAGE0:$PATH cargo install --root $PREFIX
