error building Mach on 64-bit Gentoo

[gian pendola]

Hello,
My host system is Gentoo, 64-bit. Already installed a Hurd image using qemu-KVM, and decided to build Mach from scratch on the Gentoo system.
Followed the instructions in:
http://www.gnu.org/software/hurd/microkernel/mach/gnumach/building.html
(not Debian),
I get the following:

gcc -m32 -nostdlib -nostartfiles -r -static \
  -o clib-routines.o `sed 's/^/-Wl,-u,/' < gnumach-undef` -x c /dev/null -lc -lgcc
ld -melf_i386  --defsym _START=0x100000 -T '..'/i386/ldscript  -o gnumach  gnumach.o clib-routines.o
clib-routines.o: In function `strcpy':
(.text+0x11ea8): multiple definition of `strcpy'
gnumach.o:/root/gnumach/build/../kern/strings.c:118: first defined here
clib-routines.o: In function `strncmp':
(.text+0x125ac): multiple definition of `strncmp'
gnumach.o:/root/gnumach/build/../kern/strings.c:88: first defined here
clib-routines.o: In function `strncpy':
(.text+0x33868): multiple definition of `strncpy'
gnumach.o:/root/gnumach/build/../kern/strings.c:141: first defined here
clib-routines.o: In function `time':
(.text+0x34b90): multiple definition of `time'
gnumach.o:/root/gnumach/build/../i386/i386at/kd.c:1846: first defined here
ld: Warning: size of symbol `time' changed from 8 in gnumach.o to 29 in clib-routines.o
ld: Warning: type of symbol `time' changed from 1 to 2 in clib-routines.o
clib-routines.o: In function `strcmp':
(.text+0x11e40): multiple definition of `strcmp'
gnumach.o:/root/gnumach/build/../kern/strings.c:60: first defined here
clib-routines.o: In function `__new_fclose':
(.text+0x6896): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `fflush':
(.text+0x69c0): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `_IO_wfile_underflow':
(.text+0x777e): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `_IO_new_file_underflow':
(.text+0x9259): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `_IO_file_fopen':
(.text+0xa1b2): undefined reference to `_Unwind_Resume'
clib-routines.o:(.text+0x1341e): more undefined references to `_Unwind_Resume' follow
clib-routines.o: In function `__backtrace':
(.text+0x14ebc): undefined reference to `_Unwind_Backtrace'
clib-routines.o: In function `backtrace_helper':
null:(.text+0x14f56): undefined reference to `_Unwind_GetIP'
null:(.text+0x14f76): undefined reference to `_Unwind_GetGR'
null:(.text+0x14f81): undefined reference to `_Unwind_GetCFA'
clib-routines.o: In function `__vfprintf_chk':
(.text+0x15321): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `fputs':
(.text+0x31543): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `ftell':
(.text+0x316f5): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `fwrite':
(.text+0x318fd): undefined reference to `_Unwind_Resume'
clib-routines.o: In function `_IO_getdelim':
(.text+0x31b8e): undefined reference to `_Unwind_Resume'
clib-routines.o:(.text+0x31fc9): more undefined references to `_Unwind_Resume' follow
clib-routines.o:(.eh_frame+0x7b6): undefined reference to `__gcc_personality_v0'
clib-routines.o:(.eh_frame+0x8c2): undefined reference to `__gcc_personality_v0'
clib-routines.o:(.eh_frame+0xa1a): undefined reference to `__gcc_personality_v0'
clib-routines.o:(.eh_frame+0xc1e): undefined reference to `__gcc_personality_v0'
clib-routines.o:(.eh_frame+0x339a): undefined reference to `__gcc_personality_v0'
clib-routines.o:(.eh_frame+0x3b1e): more undefined references to `__gcc_personality_v0' follow
make: *** [gnumach] Error 1

I read that someone else had similar problems because he lacked libc.a in /usr/lib, which I do have.
Trying to sort out what's happening, but I just get that it has something to do about statically linking and/or compiler directives.

I'm using glibc 2.12.2, gcc 4.5.3.
Thanks in advance for any help!

Gian Paolo