help to install RETMS

[Matteo]

HI I have a new problem to install RTEMS !
I'm using a bash, my system is linux (ubuntu) and is a centrino Intel.
I download the version rtems-4.6.5 and I unpack it in the 
directory /usr/local/rtems/source/retms4.7
after I do ;
/usr/local/rtems/source/build# ../rtems4.7/configure --target=i386-rtems4.7 --
prefix=/usr/local/rtems/rtems4.7 --enable-cxx --enable-rdbg --disable-tests --
enable-networking --enable-posix –enablertemsbsp=i386
.. and it gives me an error like the following ;
..
config.status: creating size_rtems
configure: configuring in i386-rtems4.7/c
configure: running /bin/sh '../../../rtems4.7/c/configure' '--
prefix=/usr/local/rtems/rtems4.7' '--
host=i386-r
tems4.7' '--build=i686-pc-linux-gnu' '--target=i386-rtems4.7' '--enable-cxx' '-
-enable-rdbg' '--
disable-tests
' '--enable-networking' '--enable-posix' '--enable-rtemsbsp=i386' '--with-
target-subdir=i386-rtems4.7'
'--exec
-prefix=/usr/local/rtems/rtems4.7/i386-rtems4.7' '--cache-file=/dev/null' '--
srcdir=../../../rtems4.7/c'
checking for gmake... no
checking for make... make
checking for RTEMS Version... 4.6.5
checking build system type... i686-pc-linux-gnu
checking host system type... i386-pc-rtems4.7
checking target system type... i386-pc-rtems4.7
checking rtems target cpu... i386
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for i386-rtems4.7-strip... no
checking for strip... strip
checking whether to enable maintainer-specific portions of Makefiles... no
checking if cpu i386 is supported... yes
checking for make/custom/i386.cfg... configure: error: no
configure: error: /bin/sh '../../../rtems4.7/c/configure' failed for c
root at matteo:/usr/local/rtems/source/build#

Why ? some one can help me ? I have correctly installed newlib, binutils and 
gcc yet.
Thanks on advance
Matteo Posterli