why we need gcc-3.3.6 when making gcc-4.1.0-glibc-2.3.6 cross toolchain

[Gao Bismar]

In file gcc-4.1.0-glibc-2.3.6.dat:

BINUTILS_DIR=binutils-2.16.1
GCC_CORE_DIR=gcc-3.3.6
GCC_DIR=gcc-4.1.0
GLIBC_DIR=glibc-2.3.6
LINUX_DIR=linux-2.6.15.4
LINUX_SANITIZED_HEADER_DIR=linux-libc-headers-2.6.12.0
GLIBCTHREADS_FILENAME=glibc-linuxthreads-2.3.6
GDB_DIR=gdb-6.4

but why we need gcc-3.3.6 when making gcc-4.1.0-glibc-2.3.6 cross toolchain 
?

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