Linker problems while moving C to C++

Hi,

I am using WinARM-20060117-1 with gcc 4.0.2.

I successfuly compiled my first program written in pure C.
After then I started to port my funtions into object oriented style
using C++. However after several compile and fix loops it seems that
I stuck into a linker problem on low level functions:

c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(ma 
llocr.o):
In function `_malloc_r':mallocr.c:(.text+0x430): undefined reference to
`_sbrk_r'
:mallocr.c:(.text+0x5ec): undefined reference to `_sbrk_r'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(fr 
eer.o):
In function `_malloc_trim_r':mallocr.c:(.text+0x48): undefined reference
to `_sbrk_r'
:mallocr.c:(.text+0x70): undefined reference to `_sbrk_r'
:mallocr.c:(.text+0xb4): undefined reference to `_sbrk_r'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(ma 
kebuf.o):
In function `__smakebuf':makebuf.c:(.text+0x44): undefined reference to
`_fstat_r'
:makebuf.c:(.text+0xe4): undefined reference to `isatty'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(st 
dio.o):
In function `__sread':stdio.c:(.text+0x1c): undefined reference to
`_read_r'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(st 
dio.o):
In function `__swrite':stdio.c:(.text+0x78): undefined reference to
`_lseek_r'
:stdio.c:(.text+0x9c): undefined reference to `_write_r'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(st 
dio.o):
In function `__sseek':stdio.c:(.text+0xc0): undefined reference to
`_lseek_r'
c:/winarm/bin/../lib/gcc/arm-elf/4.0.2/../../../../arm-elf/lib\libg.a(st 
dio.o):
In function `__sclose':stdio.c:(.text+0xf8): undefined reference to
`_close_r'
make.exe: *** [main.elf] Error 1


Is this specific to C++?
Isn't WinARM intended to be used with C++?
How can I solve this problem?

Thanks alot
Regards
Cem Eryasar