RSB building problem

[Zhenxing Zhang]

There is a problem as follow when I build rtems 4.11 toolchains by RSB in
ubuntu 12.04.

rerber at Rerber:~/rtems/rsb/rtems$ sudo ../source-builder/sb-set-builder
--log=l-arm.txt --prefix=/opt/rtems-4.11 4.11/rtems-arm
[sudo] password for rerber:
RTEMS Source Builder - Set Builder, v0.2.0
Build Set: 4.11/rtems-arm
Build Set: 4.11/rtems-autotools.bset
Build Set: 4.11/rtems-autotools-internal.bset
config: tools/rtems-autoconf-2.69-1.cfg
package: autoconf-2.69-x86_64-linux-gnu-1
building: autoconf-2.69-x86_64-linux-gnu-1
config: tools/rtems-automake-1.12.6-1.cfg
package: automake-1.12.6-x86_64-linux-gnu-1
building: automake-1.12.6-x86_64-linux-gnu-1
cleaning: autoconf-2.69-x86_64-linux-gnu-1
cleaning: automake-1.12.6-x86_64-linux-gnu-1
Build Set: Time 0:00:09.893937
Build Set: 4.11/rtems-autotools-base.bset
config: tools/rtems-autoconf-2.69-1.cfg
package: autoconf-2.69-x86_64-linux-gnu-1
building: autoconf-2.69-x86_64-linux-gnu-1
config: tools/rtems-automake-1.12.6-1.cfg
package: automake-1.12.6-x86_64-linux-gnu-1
building: automake-1.12.6-x86_64-linux-gnu-1
installing: autoconf-2.69-x86_64-linux-gnu-1 -> /opt/rtems-4.11
installing: automake-1.12.6-x86_64-linux-gnu-1 -> /opt/rtems-4.11
cleaning: autoconf-2.69-x86_64-linux-gnu-1
cleaning: automake-1.12.6-x86_64-linux-gnu-1
Build Set: Time 0:00:06.583940
Build Set: Time 0:00:16.482242
config: devel/expat-2.1.0-1.cfg
package: expat-2.1.0-x86_64-linux-gnu-1
building: expat-2.1.0-x86_64-linux-gnu-1
config: tools/rtems-binutils-2.24-1.cfg
package: arm-rtems4.11-binutils-2.24-1
building: arm-rtems4.11-binutils-2.24-1
config: tools/rtems-gcc-4.8.2-newlib-2.1.0-1.cfg
package: arm-rtems4.11-gcc-4.8.2-newlib-2.1.0-1
download: http://www.multiprecision.org/mpc/download/mpc-0.8.2.tar.gz ->
sources/mpc-0.8.2.tar.gz
download: ftp://ftp.gnu.org/gnu/gmp/gmp-5.0.5.tar.bz2 ->
sources/gmp-5.0.5.tar.bz2
building: arm-rtems4.11-gcc-4.8.2-newlib-2.1.0-1
Build Set: Time 0:03:35.173633
error: shell cmd failed: /bin/sh -ex
 /home/rerber/rtems/rsb/rtems/build/arm-rtems4.11-gcc-4.8.2-newlib-2.1.0-1/doit
Build FAILED

Why? Thanks!
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