Hi, I am cross compiling an application from Linux to Windows using Boost 1.42. Doing that I get an undefined reference error when linking one of my own dll's to my own application: /bin/bash ../../libtool --tag=CXX --mode=link i586-mingw32msvc-g++ -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/home/jkr/mingw/boost/include -g -O2 -Wl,--enable-runtime-pseudo-reloc,--enable-auto-import -no-undefined -L/home/jkr/mingw/boost/lib -o ORBRegistration.exe ORBRegistration-Main.o ../../../library/DagdaORB/libdagdaorb.la ../../../library/DagdaCom/libdagdacom.la /home/jkr/Programming/C++/Danu/mingw/library/DanuBase/libdanubase.la /home/jkr/Programming/C++/Danu/mingw/library/DanuStream/libdanustream.la /home/jkr/Programming/C++/Danu/mingw/library/DanuDB/libdanudb.la -lboost_system-mt -lboost_serialization-mt -lboost_thread-mt -lboost_date_time-mt -lboost_filesystem-mt -lws2_32 -lmswsock libtool: link: i586-mingw32msvc-g++ -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/home/jkr/mingw/boost/include -g -O2 -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-import -o .libs/ORBRegistration.exe ORBRegistration-Main.o -L/home/jkr/mingw/boost/lib ../../../library/DagdaORB/.libs/libdagdaorb.a /home/jkr/Programming/C++/Dagda/mingw/library/DagdaCom/.libs/libdagdacom.a ../../../library/DagdaCom/.libs/libdagdacom.a /home/jkr/Programming/C++/Danu/mingw/library/DanuDB/.libs/libdanudb.a /home/jkr/Programming/C++/Danu/mingw/library/DanuStream/.libs/libdanustream.a /home/jkr/Programming/C++/Danu/mingw/library/DanuBase/.libs/libdanubase.a -lpthread -lodbc32 -lboost_system-mt -lboost_serialization-mt -lboost_thread-mt -lboost_date_time-mt -lboost_filesystem-mt -lws2_32 -lmswsock ../../../library/DagdaORB/.libs/libdagdaorb.a(libdagdaorb_la-IMRServer.o): In function `_ZN5boost6detail19basic_cv_list_entry4waitENS0_7timeoutE': /home/jkr/mingw/boost/include/boost/thread/win32/condition_variable.hpp:82: undefined reference to `boost::this_thread::interruptible_wait(void*, boost::detail::timeout)' collect2: ld returned 1 exit status I have no idea why I get this error, and hence no idea how to solve it. Does anyone have any idea? Additional info: - I cross-compiled Boost itself using the Debian's gcc-mingw32 4.4.4-0.1+b1 crosscompiler, - I used Pthreads-w32 release 2.8.0 (2006-12-22) - The full commandline I used was (the commandline is split for readability): PTW32_INCLUDE=/home/jkr/mingw/pthreads/include PTW32_LIB=/home/jkr/mingw/pthreads/lib bjam --prefix=/home/jkr/mingw/boost --layout=tagged link=shared variant=debug,release toolset=gcc target-os=windows threading=multi,single runtime-link=shared --without-python --without-mpi -sNO_BZIP2=1 -sNO_ZLIB=1 install TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl