Hi, I feel awkward to post almost the same question again. But I really have a problem when I build 32 bits boost.regex with icu support on a 64 bits Linux machine. If I build 64 bits regex with icu support, they are fine. If I build 32 bits regex without icu support, they are fine. When I tried to build 32 bits regex with icu support, I used command for ICU building ./runConfigureICU Linux --disable-64bit-libs ./configure --prefix=/home/qhwang/mylibs_32/icu --disable-64bit-libs I checked icu libraries they are not dependent on 64bits libraries. So I'm confident they are 32bits. But when I use the command to build 32 bits regex ./bjam --prefix=/home/qhwang/mylibs/boost/ --with-regex --build-dir=/tmp/boost_build/ --build-type=complete --address-mode=32 --architecture=x86 -sHAVE_ICU=1 -sICU_PATH=/home/qhwang/mylibs/icu/ install Bjam showed ...failed updating 4 targets... ...skipped 12 targets... ...updated 7477 targets... there were only static libraries built. When I linked them to my program which were also compiled in 32 bits, the linker complained the libraries were incompatable. Could someone give me some help again? Thanks in advance. Qihong