avr-libc Fehlermeldung beim compilen

$ ./configure --prefix=$PREFIX --build=`./config.guess` --host=avr
$ make


avr-gcc -DHAVE_CONFIG_H -I. -I../../..  -I../../../common 
-I../../../include -I../../../include  -g -Wall -W -Wstrict-prototypes 
-mmcu=avr2 -D__COMPILING_AVR_LIBC__ -mcall-prologues -Os  -MT dtostre.o 
-MD -MP -MF .deps/dtostre.Tpo -c -o dtostre.o 
../../../libc/stdlib/dtostre.c
../../../libc/stdlib/dtostre.c: In function 'dtostre':

../../../libc/stdlib/dtostre.c:40:42: error: variable 'str_nan' must be 
const in order to be put into read-only section by means of 
'__attribute__((progmem))'

../../../libc/stdlib/dtostre.c:42:42: error: variable 'str_inf' must be 
const in order to be put into read-only section by means of 
'__attribute__((progmem))'
make[5]: *** [dtostre.o] Error 1