Problems running the BIT_ADA script

[Sergio]

I'm trying install RTEMS 4.5.0 (GNAT version).
When I run the bit_ada script I get the following error:

>gcc -c -O2 -I. -I../../src/libiberty/../include
../../src/libiberty/cplus-dem.c
>../../src/libiberty/cplus-dem.c:35:22: demangle.h: No such file or
directory
>gmake[1]: *** [cplus-dem.o] Error 1
>gmake[1]: Leaving directory `/tmp/rtems/tools/build-i386-tools/libiberty'
>gmake: *** [all-libiberty] Error 2
>+ check_fatal 2 '**** FAILED **** base build of C and C++ (step 1)'
>+ '[' 2 -ne 0 ']'
>+ shift
>+ echo 'ERROR: **** FAILED **** base build of C and C++ (step 1)'
>ERROR: **** FAILED **** base build of C and C++ (step 1)

I think that there is a problem with the links in the src directory.
I can reach the file demangle.h in the specified location following the
links, but seems that gcc doesn't.

I have RedHat 7.0.

Can someone help me?
Thanks.