Hi i have a problem compiling as mantioned on object of this mail: i'm changing dovecot on my debian 6 from version 2.2.32 to 2.2.36 and pigeonhole from 0.4.20 to 0.4.24
this is output of dovecot -n for listing versions installed

dovecot -n
# 2.2.32 (dfbe293d4): /usr/local/etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.20 (7cd71ba)
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.10
 i have downloaded packages from site and compiling from source

so far so good 
for pigeonhole this is the configure command that i always use

./configure CFLAGS=-O3
but when i run make this is the error that i came accross:

/bin/bash ../../libtool  --tag=CC   --mode=link gcc  -std=gnu99 -O3 -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast -fno-builtin-strftime -Wstrict-aliasing=2  -I../..  -export-dynamic  -o sievec sievec.o ../../src/lib-sieve/libdovecot-sieve.la ../../src/lib-sieve-tool/libsieve-tool.la -ldovecot-storage  -ldovecot-lda -L/usr/local/lib/dovecot -ldovecot -lrt
libtool: link: gcc -std=gnu99 -O3 -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast -fno-builtin-strftime -Wstrict-aliasing=2 -I../.. -o .libs/sievec sievec.o -Wl,--export-dynamic  ../../src/lib-sieve/.libs/libdovecot-sieve.so ../../src/lib-sieve-tool/.libs/libsieve-tool.a /usr/local/lib/dovecot/libdovecot-storage.so /usr/local/lib/dovecot/libdovecot-lda.so -L/usr/local/lib/dovecot /usr/local/lib/dovecot/libdovecot.so -lrt -Wl,-rpath -Wl,/usr/local/lib/dovecot
../../src/lib-sieve/.libs/libdovecot-sieve.so: undefined reference to `str_sanitize_utf8'
collect2: ld returned 1 exit status
make[3]: *** [sievec] Error 1
make[3]: Leaving directory `/download/dovecot-2.2-pigeonhole-0.4.24/src/sieve-tools'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/download/dovecot-2.2-pigeonhole-0.4.24/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/download/dovecot-2.2-pigeonhole-0.4.24'
make: *** [all] Error 2

What's wrong ? Thanks in advance on helping me